单项选择题

With the temperature（）so rapidly, we could not continue the experiment.

A．falling
B．fallen
C．being fallen
D．falls

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单项选择题

I am an engineer,（）I

A．aren't
B．amn't
C．are
D．am not

单项选择题

The foreigner showed us（）an English composition.

A．what to write
B．how to write
C．to how write
D．how write

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