【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】

試題分析：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。根據(jù)since可知本題應(yīng)該用現(xiàn)在完成時(shí)，fall behind落后，是個(gè)瞬間動(dòng)作，當(dāng)句中有since, for等表示時(shí)間段的時(shí)間狀語時(shí)，要把瞬間動(dòng)作改為持續(xù)動(dòng)作，所以應(yīng)該用be behind，故選D。

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