单项选择题

He didn't know ______ or go home.

A．to wait
B．if that he should wait
C．if to wait
D．whether to wait
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单项选择题
Mr. Bush ______ gardening as his hobby shortly after he retired from the General Motor last year.
A．took up
B．took back
C．took in
D．took over
单项选择题
It was not until he arrived at the railway station ______ he realized he had forgotten his ticket.
A．before
B．since
C．when
D．that
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