单项选择题

单项选择题 We （）around the factory during our visit.

A、showed
B、were shown
C、have shown

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

A、rings
B、rang
C、will ring
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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