问题
When first ________ to the market, the computer software ． was not a success due to its complexity in operation.
A:introducing
B:being introduced
C:introduced
D:to be introduced
B:being introduced
C:introduced
D:to be introduced
正确答案是：
同类题型
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.He always_________his time and his efforts .
shown in the movie, under no circumstances__________ faith and confidence.
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The football match will this Saturday, so the boys who will take part in it should be well prepared.