I had just gone to bed after a tiring daythe phone rang loud enough to wake up the dead.A.

问题补充：

I had just gone to bed after a tiring daythe phone rang loud enough to wake up the dead.

A. as

B. when

C. after

D. while

答案：

A. as

(答案→)B. when

C. after

D. while

解析：这题考察固定搭配,sb had done when…“某人刚刚做完什么这时…”，句意是：一天疲惫之后刚刚去睡觉这时电话响起，声音大的足够把死人吵醒。选B。