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??
下面这两句话中的 over 分别是什么词性?为什么?So far in Wuhan, over 200 illegal wharves have been shut
down.the Wuhan
goverment have shut down over 200
illegal wharves so far.