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

試題分析：句意：自從歷史之初人們就用河水來作為交通工具，根據(jù)句意和since引導(dǎo)的從句可知用完成時(shí)，現(xiàn)在完成時(shí)的構(gòu)成have done的結(jié)構(gòu)。結(jié)合語境故選B
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