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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单项选择题
Returning to my apartment, （）.

A．I found my camera to miss
B．I found my camera missing
C．my camera was missing
D．my camera was missed
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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