you must keep your son ____ nine hours a day .A.going to bed B.sleeping C.falling asleep D.slept

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you must keep your son ____ nine hours a day .A.going to bed B.sleeping C.falling asleep D.slept
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you must keep your son ____ nine hours a day .A.going to bed B.sleeping C.falling asleep D.slept
you must keep your son ____ nine hours a day .
A.going to bed B.sleeping C.falling asleep D.slept

you must keep your son ____ nine hours a day .A.going to bed B.sleeping C.falling asleep D.slept
B
这句话的意思是你必须保证你儿子每天至少9小时的睡眠.或者你必须办证你儿子每天能睡9小时.
选B是因为keep sb doing sth 是一个固定搭配

Bsleeping
going to bed 和falling asleep 都是瞬间动作,是不能和keep连用的
B 和C 对比, B 符合句型keep doing sth