单项选择题

The whole building _______ burned down. But the heavy rain

A．might have been; had helped
B．could have been; helped
C．was; could help
D．must have been; help
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单项选择题
______ of us can do everything, but all of us can do something.
A．Everyone
B．Any
C．None
D．Some
单项选择题
Not once in these years ______ the prices of these products.
A．we changed
B．have we changed
C．did we change
D．we have changed
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