【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，所以應該用be behind，故選D。

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