摘要： When first to the market, these products enjoyed great success.
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When first______to the market,these products enjoyed great success.
A.introducing B.introduced
C.introduce D.being introduced
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When first __________to the market ,these products enjoyed great success .
A )introducing B) introduced C) to introduce D) being introduced
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When first to the market, these products enjoyed great success.
A. introducing B. introduced C. to introduce D. being introduced
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