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When first______to the market,these products enjoyed great success.

A.introducing                      B.introduced

C.introduce                          D.being introduced

  When first __________to the market ,these products enjoyed great success .

    A )introducing    B) introduced    C) to introduce   D) being introduced

When first        to the market, these products enjoyed great success.

    A. introducing    B. introduced     C. to introduce   D. being introduced

When first____ to the market, these products enjoyed great success.

   A. introducing  B. introduced  C. introduce   D. being introduced

When first __________to the market ,these products enjoyed great success .

    A )introducing    B) introduced    C) to introduce   D) being introduced