单项选择题

Doctor Godwin says that ______ what forceful arguments against smoking there are, many people persist in smoking.

A．though
B．however
C．no matter
D．but
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单项选择题
It wasn't such a good dinner ______ she had promised us.
A．that
B．which
C．as
D．what
单项选择题
If he hadn't stood under the ladder to catch you when you fell, you ______ here now.
A．wouldn't be smiling
B．won't smile
C．couldn't have smiled
D．didn't smile
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