单项选择题

We are ______ to know what he means.

A．at a loss
B．at least
C．at once
D．at ease
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单项选择题
We were asked to ______ our essay in three days.
A．hand over
B．hand in
C．hand out
D．hand down
单项选择题
He ordered that the books ______ at once.
A．would be sent
B．be sent
C．would send
D．send
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