You'd better wake him up at once.He ---for ten hours alreadyA.has been asleepB.had fallen asleepC.has gone to bed D.has gone to sleep

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You'd better wake him up at once.He ---for ten hours alreadyA.has been asleepB.had fallen asleepC.has gone to bed D.has gone to sleep

You'd better wake him up at once.He ---for ten hours alreadyA.has been asleepB.had fallen asleepC.has gone to bed D.has gone to sleep
You'd better wake him up at once.He ---for ten hours already
A.has been asleep
B.had fallen asleep
C.has gone to bed
D.has gone to sleep

You'd better wake him up at once.He ---for ten hours alreadyA.has been asleepB.had fallen asleepC.has gone to bed D.has gone to sleep
A.has been asleep

A
因为其它的都是瞬间性动词,不能跟for+时间段连用的