He has been studying in the library every night ______the last three months.A、si

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问题 He has been studying in the library every night ______the last three months.

选项 A、since
B、until
C、for
D、before

答案 C

解析本题干意思为“他在过去的三个月中每天晚上都到图书馆学习”。这里需要介词for来引导表示一段时间的短语，所以答案为C)。

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