单项选择题

Perhaps you（）leave now. Your friend may be waiting for you outside.

A. must
B. could
C. should
D. will

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The first step in setting up your home office is to decide（）you will use your office for.

A. where
B. what
C. when
D. how
单项选择题
The shop assistants said that they could never be（）polite to their customers.

A. so
B. enough
C. very
D. too
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