单项选择题

If you（）me about it earlier, I would have been more careful to do it.

A．have told
B．had told
C．told
D．tell

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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

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

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