【題目】He _____ with English grammar every night over the last three months.

A. struggles B. struggled

C. has been struggling D. had been struggling

【答案】C

【解析】考查動詞時態(tài)。句意：在過去的三個月里他每天晚上都在努力學英語語法。根據(jù)over the last three months可知強調(diào)在過去時間段，一直從事某件事，優(yōu)先選擇現(xiàn)在完成進行時，即C項正確。

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