单项选择题

He demanded that the problem ______ at once.

A．would be solved
B．is to be solved
C．is solved
D．be solved
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单项选择题
Without the worker's help, Sam ______ so much progress.
A．would not make
B．would not have made
C．will not make
D．did not make
单项选择题
You ______ yesterday if you were really serious about the job.
A．ought to come
B．ought to be coming
C．ought to have come
D．ought have come
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