He hasn’t heard from his friend______last month.

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问题 He hasn’t heard from his friend______last month.

选项 A、since
B、by the end of
C、for
D、until

答案A

解析 此题学生容易受思维定势not…until...的影响误选D。since用于现在完成时,如果此题是一般过去时就选择D。
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