单项选择题

The survey shows that the product will be popular in the market, ______ the company cuts down the selling price for 10%.

A. if

B. unless
C. when

D. whether
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The piano weighs three hundred pounds, so it is too heavy ______.
A. for me to move
B. to move by me
C. for me not to move
D. not to move by me
单项选择题
Never before ______ so highly successful in changing his surroundings.
A. man has been
B. man is
C. has man been
D. is man
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