单项选择题

The teacher often warns the students that they can't be ______ careful in doing experiment.

A) much
B) most
C) so
D) too
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单项选择题
He's studying hard in case that he ______.
A) would lag behind
B) lags behind
C) should lag behind
D) could lag behind
单项选择题
Tom has not decided whether he will ______ the branch company set up in New York.
A) hand in
B) take over
C) lead to
D) put on
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