单项选择题

I ______ on a book with him. He help me a lot with collecting materials.

A．cooperate
B．operate
C．collate
D．collaborate
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单项选择题
Working consistently without rest, a lot of doctors and nurses ______ SARS.
A．go down with
B．go into
C．go for
D．go away
单项选择题
I ______ you that there' s no danger.
A．ensure
B．assure
C．insure
D．secure
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