单项选择题

The children will not be allowed to come with us if they don't ______ themselves.

A．guide
B．behave
C．act
D．direct
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单项选择题
I was in a hurry. Not until I got to the airport ______ my passport missing.
A．I did find
B．had I found
C．I found
D．did I find
单项选择题
I'll get it for you ______ I could remember who last borrowed it.
A．on condition
B．as far as
C．if only
D．lest
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