单项选择题

（）we can't get the necessary equipment, what shall we do

A．Since
B．Supposing
C．As long as
D．In case

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单项选择题
I remember（）to help us if we ever got into trouble.

A．once offering
B．him once offering
C．him to offer
D．to offer him
单项选择题
Medical research has shown that the widespread of use of cigarettes contributes（）the increase of cancers.

A．to wards
B．for
C．with
D．to
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