单项选择题

This semester, the courses Williams has taken are History, Mathematics, Chemistry and Physics, Mathematics ______ the most important.

A．is
B．being
C．has been
D．of
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单项选择题
It is prudent to keep your child within ______ when shopping.
A．distance
B．reach
C．bound
D．safety
单项选择题
The French pianist has not decided yet which orchestra
A．is to work with
B．to work with
C．should work with
D．he will work
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