单项选择题

You ______ him that the day before.

A．ought not to have told
B．must not have told
C．should not tell
D．ought not to tell
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单项选择题
We ______ your terms carefully but ______ to say that we cannot accept them.
A．are studying; regret
B．have studied; are regretting
C．have studied; regret
D．have been studying ;have regretted
单项选择题
Greater knowledge of the universe could ______ important changes in the outer space traveling.
A．take back
B．break out
C．bring about
D．keep out
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