单项选择题

Only the __________ will bite for blood.

A．male
B．baby mosquitoes
C．mosquito
D．female
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It is essential that we __________ measures to protect the ozone layer.
A．will take
B．should take
C．would take
D．took
单项选择题
I lost my bag the day before, but it __________ now.
A．has found
B．was found
C．has been found
D．is found
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