【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:Mike過(guò)去是一名優(yōu)秀的學(xué)生,但是自從他沉迷于電腦游戲他就落后了。since是現(xiàn)在完成時(shí)的標(biāo)志。fall behind落后,是瞬間動(dòng)詞,不可以表示持續(xù),故選D。

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