题目内容

People _________ rivers for transportation since the beginning of history.
A．usedB．have usedC．useD．had used
B

试题分析：句意：自从历史之初人们就用河水来作为交通工具，根据句意和since引导的从句可知用完成时，现在完成时的构成have done的结构。结合语境故选B
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