单项选择题

You have to be ______ when you try to work out mathematical formulas.

A．reasonable
B．rational
C．logical
D．sound
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单项选择题
Ifs no good ______ him. He is always indifferent towards other’’s matters.
A．to turn to
B．turning to
C．turn to
D．turned to
单项选择题
Let’’s ______ this has never happened.
A．make believe
B．make to believe
C．to make believe
D．to make to believe
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