【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:邁克過去是一名尖子生。但是自從他沉迷于電腦游戲后,他落后了。據(jù)since可知本題應(yīng)該用現(xiàn)在完成時,fall behind落后,是個瞬間動作,當句中有since,for等表示時間段的時間狀語時,要把瞬間動作改為持續(xù)動作,所以應(yīng)該用be behind,故D。

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