单项选择题

I am an engineer,（）I

A．aren't
B．amn't
C．are
D．am not

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单项选择题
It is as difficult to persuade him not to smoke（）to keep me from singing songs.

A．so is it
B．so it is
C．as it is
D．as is it
单项选择题
We are looking forward（）you soon.

A．to see
B．to seeing
C．see
D．to be going to see
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