问题补充：
The astronaut is so tired that he for eleven hours.
A. has been asleep
B. has fallen asleep
C. has gone to bed
D. has gone to sleep
答案：
(答案→)A. has been asleep
B. has fallen asleep
C. has gone to bed
D. has gone to sleep
解析：句意：这个宇航员是如此的累以至于他睡了11个小时了。本句是现在完成时态，后面跟for引导的时间段，动词要用延续性动词，只有be asleep表示状态，故选A。
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