单项选择题

Space vehicles were launched into outer space______search of another livingplanet.

A．to
B．at
C．in
D．for
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单项选择题
______does Mr. Johnson go to London on business At least once a month.
A．How many
B．How long
C．How often
D．How
单项选择题
You two have got a lot______.
A．in general
B．in common
C．in all
D．in any case
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