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用括号中动词的正确形式填空(新概念英语第二册23课)

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用括号中动词的正确形式填空(新概念英语第二册23课)
1.after he had read the book,he_________(write) a review of it.
2.He did not leave his office until he________(finish) work.
3.If he________(break) his promise,I'll never spesk to him again.
4.If the weater is fine,we________(go) for a picnic,
1:时态一致,前面是过去时,后面也要用过去时,所以用write的过去式wrote.
2:解释同上 finished
3:if引导条件状语从句,用一般现在时表示将来时,所以用breaks
4:解释同第三题,用will go