单项选择题

His homework ______, Bob decided to go and see the film.

A．done
B．was done
C．had been done
D．did
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单项选择题
Although her marriage was very unhappy, Mrs. Stephens remained with her husband for the ______ of the children.
A．reason
B．sake
C．care
D．convenience
单项选择题
This bestseller is well worth ______.
A．to read
B．reading
C．to be read
D．being read
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