【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】句意:在過去的三個月里他每天晚上都在努力學(xué)英語語法。根據(jù)over the last three months可知強(qiáng)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(jìn)行時,即C項(xiàng)正確。

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