The boy was often heard ___ happily in the room.A. sing B. to sing C. singing
D.sings有人认为因句中的often,所以是听到唱歌的全部过程，所以选择B.但是我觉得C. singing也可以。经常听到不完整事件也符合逻辑呀。下面句子摘自牛津:You can ofte...
To do CPR(心肺复苏), you press onthe sick person’s chest so that blood moves through the body and takes oxygen to organs.这是 2017 年高考英语北京卷阅读 A 中的句子，这里的不定式 to do CPR 是时间状语吗？感觉不能分析为目的状语或条件状语吧！
...时的正确性，请老师指教 Peru’s culture ministry says the cat wasn’t seen before because it’s on a very steep hill. The picture had almost disappeared because of erosion. Parts of the drawing were worn away by natural forces, such as wind and water. The drawing has been cle...
... Jeff stayed calm and turned off the gas quickly. But the stove was
a mess now. Jenna told Jeff to clean it up so they could continue to cook the
rest of the porridge. But Jeff’s hand touched the hot burner and he gave a cry
of pain. Jenna made him put his hand in cold water. Then she caught the s...
Even if the first mission does end up in a fireball, though, the Falcon Heavy's extra capacity and the savings from recyclability mean that if and when it works reliably, the costs of getting big objects into space could fall by an order of magnitude from those of the Delta IV Heavy. Indeed, the...
It is agreed that they enjoy making noises, and during the first few mouths one or two noises sort themselves as particularly expressive as delight, pain, friendiness, and so on.我想问一下老师这句话怎么翻译，主要是从sort后面那部分感觉很蒙。