单项选择题

单项选择题 The teacher will not let anyone leave the classroom until the bell （）

A、rings
B、rang
C、will ring

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单项选择题
I'm busy now, so it will be some time （）I can leave.

A、before
B、after
C、when
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Mr. Boffin drove there and （）his car outside the station.

A、parked
B、carded
C、set
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