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【题目】Mike used to be a top student, but he ______ behind since he lost himself in computer games.
A.fell
B.has fallen
C.was
D.has been

【答案】D
【解析】句意:Mike过去是一名优秀的学生,但是自从他沉迷于电脑游戏他就落后了。since是现在完成时的标志。fall behind落后,是瞬间动词,不可以表示持续,故选D。

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