题目内容

So difficult______ it to acquire a large vocabulary without the help of a teacher that he was close to giving up .?
A.he have feltB.have he felt?
C.he did feelD.did he feel?
D
在so...that结构中,若将表示程度的状语“so+adj./adv.”置于句首,主句中需用倒装语序,从句中的时态决定着主句中须用一般过去时。?
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