John and Sue ______ computer games for hours before their parents came home from work.

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问题 John and Sue ______ computer games for hours before their parents came home from work.

选项 A、are playing
B、have been playing
C、played
D、had been playing

答案D

解析考查时态。由于从句是before引出的表过去的时间状语，因此主句也要用过去时态；而主句中又有一个表示时间段的状语for hours，故主句还要用完成时态。[D]项为过去完成进行时，强调在过去某一时间段内一直做某事，符合题目要求。

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