[单选题,10分] John and Sue_______computer games for hours before their parents came home from work.<br>A.are playing<br>B.have been playing<br>C.played<br>D.had been playing

[单选题,10分] John and Sue_______computer games for hours before their parents came home from work.
A.are playing
B.have been playing
C.played
D.had been playing

出自：云南工商学院-生活英语听说

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