单项选择题

If the earth suddenly ______ spinning, we would all fly off it.

A．stopped
B．had stopped
C．has stopped
D．would stop
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单项选择题
______ the punishment was unjust, Helen accepted it without complaint.
A．However
B．So long as
C．Since
D．Even though
单项选择题
Is it necessary to______ our body to the sunlight
A．reveal
B．display
C．expose
D．show
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