【題目】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】句意為“Mike過去是尖子生，但自從迷上電子游戲以來成績(jī)落后了”。由since可知but后的主句用現(xiàn)在完成時(shí)，瞬間動(dòng)詞fall不能和since引導(dǎo)的時(shí)間狀語(yǔ)從句連用，故用延續(xù)性動(dòng)詞be。故選D。

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