单项选择题

Only ten to twenty percent of cold viruses are transmitted by carriers, who, sneezing and coughing, ______ the viruses into the air.

A. spray
B. sprinkle
C. spread
D. sprout
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单项选择题
He mast have had an accident, or he ______ now.
A. would have been here
B. had to be here
C. should be here
D. would be here
单项选择题
These surveys indicate that many crime go ______ by the police, mainly because not all victims report them.
A. unrecorded
B. to be unrecorded
C. unrecording
D. to have been unrecorded
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