When first __________ to the market, the computer software was not a success due to its complexity in operation.
A．introducingB．being introduced
C．introducedD．to be introduced
C
本題考查非謂語動詞。句中邏輯主語為the computer software，與introduce的關(guān)系為被動關(guān)系，故用過去分詞，選C。
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