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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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
单项选择题
His salary as a driver is much higher （）.

A、 than a teacher
B、 than that of a teacher
C、 than of a teacher
D、 than those of a teacher
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