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2.After ___ seemed to be a long time,the old man went out of

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2.After ___ seemed to be a long time,the old man went out of the professor's sitting room.
A.it B.that C.which D.what
我明白从句缺主语,但为什么不是which?
3.The most exciting thing for him was___ he finally successed in___seemed to be the most difficult exam to him.
A.that;what B.that;which C.what;that D.what;which
我明白第一个空是that,第二个空是从句缺主语,但为什么不是which?
2.after是介词,介词后加名词性从句,连接词只有that,what,又因为缺主语,所以用what
3.A in 是介词.理由同2 which一般是出现在定语从句的,在名词性从句中,只有前面给定范围,表示“哪一个”才用which.