单项选择题

We are ______ to know what he means.

A．at a loss
B．at once
C．at least
D．at ease
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单项选择题
By the time this talk is over, we ______ a lot about the earth.
A．shall be learning
B．are learning
C．would learn
D．shall have learnt
单项选择题
They went to San Francisco ______ gold.
A．for search of
B．in search of
C．to search in
D．search for
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