单项选择题

As it turned out to be a small house party, we（）so formally．

A．need not have dressed up
B．must not have dressed up
C．id not need to dress up
D．must not dress up

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单项选择题
Many of the students have a grasp of the main structures, a reasonable vocabulary and a(n)（）idea of how to pronounce most words they come across.

A. faint
B. vague
C. obscure
D. rough
单项选择题
How can I ever concentrate if you（）continually（）me with silly questions?

A．have, interupted
B．had, interrupted
C． are, interrupting
D．were, interrupted
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