单项选择题

The police are ______ this matter.

A. looking on

B. looking into
C. looking at

D. looking out

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单项选择题

I regret to tell you that I have no choice ______ to refuse your application.

A. than

B. and
C. but

D. or

单项选择题

Please say hello to Mr. Smith. Not ______ his address, I can’t visit him personally.

A. known

B. know
C. to know

D. knowing

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