单项选择题

It ______ every day so far this month.

A．has rained
B．rains
C．rained
D．is raining
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单项选择题
Scientists generally agree that the Earth's climate will warm up over the next 50 to 100 years ______ it has warmed in the 20000 years since the Ice Age.
A．as soon as
B．as long as
C．as much as
D．as well as
单项选择题
Mr. Johnson couldn't shake the ______ that these wounded soldiers were in deep trouble and it was up to him to help them.
A．convention
B．conservation
C．conviction
D．conversion
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