And last year Khan Academy and the College Board unveiled a free course they say boosts SAT scores for students at all income levels.这里的黑体部分是插入语吗,如果是为什么没有逗号呢?如果不是那是什么成分?
This is the question about which we've had so much discussion这句话中为什么要有个介词about?Everything that he said seemed quite reasonable这句话中为什么又没有介词了?介词什么时候,用什么时候不用??
One way is to teach people how to avoid catching the virus sexually through condom promotion.promotion可理解为倡导,但这个sexually我不理解,这句话从sexually到后面就不知道怎么翻译理解了,求助!
原句:People had no choice but to get their drinking water from toxic sources, and scores ended up in emergency rooms with gastrointestinal illnesses. 请问老师这句话后面的 scores 是不是 scores of them 省略了 of them.