31.Father is sleeping.You 'd better___quiet.A to keep B keep C keeping D kept

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31.Father is sleeping.You 'd better___quiet.A to keep B keep C keeping D kept

31.Father is sleeping.You 'd better___quiet.A to keep B keep C keeping D kept
31.Father is sleeping.You 'd better___quiet.
A to keep B keep C keeping D kept

31.Father is sleeping.You 'd better___quiet.A to keep B keep C keeping D kept
原形,have better 后接动词原形