题目内容
Every _____ hundred metres, there are watch towers, _____soldiers keep watch.
A. a few, where, used to B. few, where, used to
C. few, which, used to D. a few, which, were used to
B
“每隔几百米”用every few,后面两个空分别是定语从句的连词和used to过去常常。
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