单项选择题

Present at the Christmas party were the two princesses and their ______ husbandsand the Duke of Edinburgh.

A．respectable
B．respectful
C．respective
D．respected
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单项选择题
He has devoted his life ______ disabled people.
A．to helping
B．to help
C．helping
D．help
单项选择题
At each end of the tube ______ , one which gathers light and one which magnifies the image.
A．are two lenses there
B．two lenses are
C．are two lenses
D．two lenses are there
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