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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单项选择题
Seldom（）such a wonderful movie since I graduated in 2000.

A．had I seen
B．did I see
C．have I seen
D．I have seen
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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