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
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The French pianist has not decided yet which orchestra
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If he had left in time for the last bus, he ______ it.
A．shouldn't have missed
B．ought not have missed
C．mustn't have missed
D．couldn't have missed
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