问题描述：
题目是把两句话连成一句 We did not disturb him (until) He finished work.
1.We did not disturb him until He had finished work.
2.We had not disturbed him until He finished work.
哪句正确为什么?
书上有一句例句 :I had not understood the problem until he expained it.有一位高手说书上的例句错了.
1.We did not disturb him until He had finished work.
2.We had not disturbed him until He finished work.
哪句正确为什么?
书上有一句例句 :I had not understood the problem until he expained it.有一位高手说书上的例句错了.
问题解答：
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