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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:迈克过去是一名尖子生。但是自从他沉迷于电脑游戏后,他落后了。据since可知本题应该用现在完成时,fall behind落后,是个瞬间动作,当句中有since,for等表示时间段的时间状语时,要把瞬间动作改为持续动作,所以应该用be behind,故D。

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