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I suspect he knows more than he is _______.

About this question

This question belongs to "Luyện tập cụm động từ nhóm Keep, Let & Live" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.

Question detail

I suspect he knows more than he is _______.

A

letting on

B

letting off

C

keeping at

D

keeping back

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