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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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
单项选择题
He has two Chinese-English dictionaries, （） were bought last week.

A、 two of which
B、 both of which
C、 both of them
D、 all of them
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