When first to the market, the computer software ． was not a success due to its c
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When first ________ to the market, thecomputer software ．was not a success due to its complexity in operation.
| A．introducing | B．being introduced | C．introduced | D．to be introduced |
试题答案
【答案】
C
【解析】状语从句的省略 ， 完整的从句为 ： When it was first introduced.