单项选择题

What is written on the bus door is: "Don’t get off until the bus（）. "

A. has stopped
B. stops
C. could stop
D. will stop

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单项选择题
On no account（）to anyone who works in the company.

A. must mention my name
B. my name must mention
C. my name must be mentioned
D. must my name be mentioned
单项选择题
（）there are several thousand languages and dialects spoken in the world.

A. When it is estimated
B. It has been estimated that
C. To estimate that
D. If it is estimated that
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