单项选择题

Who can it be I'm quite ______a loss to guess.

A．of
B．on
C．in
D．at
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单项选择题
These three teachers vary ______ their manner of teaching.
A．between
B．from
C．with
D．in
单项选择题
In learning English we should not ______our students of their mistakes all the time.
A．remind
B．remember
C．remain
D．remark
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