单项选择题

______ we have finished the book, we shall start doing some exercises.

A．For now
B．Since that
C．Now that
D．Since already
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单项选择题
I'd rather sleep than watching TV; the programs seem ______ all the time.
A．to get worse
B．to have got worse
C．to be getting worse
D．getting worse
单项选择题
We______ on it for many hours but we have not yet reached any concinsion.
A．work
B．have been worked
C．have been working
D．are working
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