Three trees can do the job of 15air-conditioners _________ almost all day.
A．runB．a(chǎn)re runningC．ranD．running
D

試題分析：句意：3棵樹能夠做到15臺空調(diào)幾乎一整天不停運作才做到(使人涼爽)的事情。根據(jù)句意可知應用running，故選擇D。
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