The two boys games on the puter for three hours, and they would continue till midnight
A. were playing
B. had played
C. had been playing
D. has been chatting
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(答案→)A. were playing
B. had played
C. had been playing
D. has been chatting
解析：句意：这两个男孩已经玩游戏3个小时了，而且还将继续到午夜。这个过去的
“过去”一直在进行并且将延续，动作当然应该用过去完成进行时来表达。