题目内容

The letter we sent 2 days ago is an enquiry____color TV sets.

A.about
B.for
C.of
D.as

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When____an enquiry, you ought to enquiry into quality, specification and price, etc.

A. making
B. offering
C. sending
D. giving

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A. thank you
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C. found
D. appreciated

This chemical is made____a special formula.

A.from
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C.of
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A.at
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