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She ________ know the answer but I'm not sure.
A. maybe
B. may be
C. may
D. must
A. maybe B.may be C.may D.must
She ________ know the answer, but I'm not sure．
A．maybe
B．may be
C．may
D．must
She _________ know the answer, but I'm not sure．
She ________ know the answer, but I'm not sure.
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