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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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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.introduce              D.being introduced

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