We have been studying German ______ we entered this school.

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问题 We have been studying German ______ we entered this school.

选项 A、as
B、since
C、while
D、because

答案B

解析 as意为“当…时候”；since意为“自从…时候”，其主句采用现在完成时或现在完成进行时；while意为“当…时候”；because意为“因为”，故根据句意答案为[B]。

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