单项选择题

The students are busy ______ the examination.

A．preparing for
B．preparing
C．to prepare
D．to prepare for
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单项选择题
My new glasses cost me ______ the last pair that I bought.
A．three times
B．three times as much as
C．three times as much
D．three times much as
单项选择题
A．preventedB．protectedC．blockedD．refused
A．prevented
B．protected
C．blocked
D．refused
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