How can you expect to learn anything you spend all your time playing computer games?A. un

问题补充：

How can you expect to learn anything you spend all your time playing computer games?

A. unless

B. until

C. though

D. when

答案：

A. unless

B. until

C. though

(答案→)D. when

解析：当你把全部时间都花在玩电脑游戏时，你怎能期望学一些东西？故应选D。A. unless 如果不，除非 B.until 直到 C.though虽然，尽管 D. when 当……时。