单项选择题

Tom has been in the factory ______ he left school.

A．
[A] when

B．
[B] as soon as

C．
[C] since

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单项选择题
He has searched his bag ______ 2 hours for his picture.
A．
[A] for

B．
[B] with

C．
[C] in
单项选择题
She forgot ______ her exercise again.
A．
[A] to do

B．
[B] doing

C．
[C] do
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