单项选择题
While I was waiting for her, I killed time ______ looking in the show windows.
A．by
B．with
C．in
D．over
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单项选择题
They ______ shopping, when someone knocked at the door.
A．are about to
B．are to go
C．were about to go
D．were to go
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单项选择题
He gained his ______ by printing ______ of famous writers.
A．wealth; work
B．wealthy; works
C．wealthy; work
D．wealth; works
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