问题描述：
they believed that by using computers the production of their factory____.
A will greatly increased B has greatly increased C would be increased greatly D had been greatly increased 为什么选C? increase在这里能用被动语态?
A will greatly increased B has greatly increased C would be increased greatly D had been greatly increased 为什么选C? increase在这里能用被动语态?
问题解答：
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