【題目】Thanks to the cleaners, the environment_____ in our city recently.

A. improved B. improves C. has improved D. had improved

【答案】C

【解析】試題分析：句意：多虧了環(huán)衛(wèi)工人，我們城市的環(huán)境最近提高了。根據(jù)recently可知，本題用現(xiàn)在完成時(shí)。故選C。

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