单项选择题

Your cough will get worse ______ you give up smoking.

A. so long as
B. on condition that C. unless
D. otherwise
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单项选择题
(I invited) Joe and Linda (as well as) Tom (to dinner), but (neither) of them came.
A. I invited
B. as well as
C. to dinner
D. neither
单项选择题
Canning (is) the (most wide) used (method) of food (preservation).
A. is

B. most wide
C. method

D. preservation
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