单项选择题


A．With
B．On
C．In
D．At
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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
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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