问题 Pumas never attack a human being expect____cornered.

Pumas never attack a human being expect ____ cornered.A.they are B.being C.that they are D.when they areexcept作为介词使用后面应该是可以跟动名词的，为什么这道题选B不对？

问题 but despite 与 but because

...ess. Laughter does produce short-term changes in the function of the heart and its blood vessels boosting heart rate and oxygen consumption. But because hard laughter is difficult to sustain, a good laugh is unlikely to have measurable benefits the way, say, walking or jogging does.1. but为并列...

问题 be joined by的意思

....She knew from the way the doctors talked that there was little hope. be joined by什么意思？与...会合吗？怎么用被动语态？

问题 turn out to be...中的不定式作什么成分

The plan turns out to be a failure. 在这句话中不定式做什么成分?

问题 engage in，be engaged in，engage to 有什么区别？

engage in，be engaged in，engage to 有什么区别？怎么使用？

问题 engage in，be engaged in，engage to 有什么区别？

engage in，be engaged in，engage to 有什么区别？怎么使用？

问题 刘老师请问这里的be abandoned in favour of怎么理解呢

原句是The coal industry should be abandoned in favour of alternative energy sources.意思是应该用其他的替代能源来取代煤矿业.那么不应该是be abandoned with in favour of吗

问题 being done现在分词的被动语态 作状语 与句子主语之间是主动还是被动关系呢？

如题：being done现在分词的被动语态 作状语 与句子主语之间是主动还是被动关系呢？因为一般都说现在分词作状语，与句子主语是主动的关系。而这里的being done又明确的表示被动含义，所以请问各位老师，应该如何理解呢？

问题 lack, be lacking in 有什么区别

问题 【问题讨论】（句子分析与翻译）（5）

...子分析与翻译）（5）In order for the structure to achieve the size and strength necessary to meet its purpose, architecture employs methods of support that, because they are based on physical laws, have changed little since people first discovered them—even while building materials have ch...

问题 thus在句子中的具体意思

Although the process of professionalisation and specialization was already well under way in British geology during the nineteenth century, its full consequences were thus delayed until the twentieth century.虽然职业化和专业化的过程在19世纪的英国地质学界中已经形成，但是...

问题 render在句子中是“使得；致使”的意思吗

Perhaps it is a humble lamp that ignites our lives by accident and renders us free from difficulties.也许就是那么一盏毫不起眼的灯，不经意间点亮了我们的人生，帮助我们摆脱了困境。请问render在句子中是“使得；致使”的意思吗？然后free from diffic...

问题 all my life与时态

When I grew into a young man, I suddenly fell ill one day and it was discovered that I had a terrible kidney disease. I had to accept treatments all my life, or get a transplant.请问专家老师，这里的all one's life用于了一般过去时态，感觉怪怪的，总觉得用于一般过...

问题 include sth in it中in it可以删去吗

The price includes the furniture in it 中 in it 可以删去吗？

问题 It's good stuff.为什么不用不定冠词

为什么是 it's good stuff? 而不是 it's a good stuff?这句话是什么意思？