单项选择题

Thank you for giving me a hand. I ______ in the experiment without your valuable help.

A. have failed
B. will fail
C. would have failed
D. must have failed
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单项选择题
In ______ review of 44 studies, American researchers found that men and women who ate six key foods daily cut the risk of ______ heart disease by 76%.
A. a; the
B. the; a
C. a; /
D. /; a
单项选择题
Although the wind has ______ , the rain remains steady, so you still need a raincoat.
A. turned up
B. gone back
C. died down
D. blown out
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