When first ________ to the market, the computer software ． was not a success due to its complexity in operation.
A．introducingB．being introducedC．introducedD．to be introduced
C
考查非謂語動(dòng)詞。Introduce與the computer software為為動(dòng)賓關(guān)系故用過去分詞作狀語。句意：電腦軟件初次引進(jìn)市場是由于操作復(fù)雜沒有成功。
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