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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单项选择题
If you have trouble ______ the poems, the notes on the mar gins will help you.
A．to understand
B．understanding
C．for understanding
D．with understanding
单项选择题
He demanded that the problem ______ at once. A. would be solved 13. is to be solved C. is solved D. be solved
A．is solved
B．be solved
C．13. is to be solved
D．He demanded that the problem ______ at once.
E．would be solved
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