单项选择题

He must have had an accident, or he ______ here then.

A．would have been
B．had been
C．should be
D．could be
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单项选择题
If only you ______ him what I said! Everything would have been all right.
A．didn"t told
B．hadn"t told
C．would not tell
D．would have not told
单项选择题
It s high time we ______ our attention to this problem.
A．turned
B．turn
C．had turned
D．would turn
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