单项选择题

Without computer, we ______ great progress in the last decades.

A．would not make
B．will not make
C．could not make
D．should not have made
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单项选择题
Not until I began to work ______ how much time I had wasted.
A．have I realized
B．I have realized
C．did I realize
D．I realized
单项选择题
He told me that I ____ be present at the ceremony.
A．could
B．would
C．should
D．might
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