题目内容

Three trees can do the job of 15air-conditioners _________ almost all day.
A．runB．are runningC．ranD．running
D

试题分析：句意：3棵树能够做到15台空调几乎一整天不停运作才做到(使人凉爽)的事情。根据句意可知应用running，故选择D。
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