问题描述：
My teacher once advised me not _____ everything.
My teacher once advised me _____ everything.
A.to pretend to know
B.pretending knowing
C.to pretend knowing
D.pretending to know
My teacher once advised me _____ everything.
A.to pretend to know
B.pretending knowing
C.to pretend knowing
D.pretending to know
问题解答：
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