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
Not all universities in the U.S. offer a full ______ of programs leading from a BA degree to postgraduate education through the doctorate.
A．variety
B．category
C．load
D．range
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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