How can they learn much they spend so much time playing computer games?A. althoughB. when

问题补充：

How can they learn much they spend so much time playing computer games?

A. although

B. when

C. till

D. until

答案：

A. although

(答案→)B. when

C. till

D. until

解析：考察连词辨析。A尽管；B当…时；既然；C/D直到…才；句意：既然他们吧如此多的时间花在了玩电脑游戏上，他们又怎么能学到这么多的知识呢？根据句意说明B正确。