【题目】As a result of the use of the new technology, the production of this product________50 percent.
A．has risen to
B．has been raised to
C．has risen by
D．has been risen by
在线课程【答案】C
【解析】rose是不及物动词，不能用被动语态；如果是增长或提高了百分之多少，必须用介词by，用介词to时只能是具体数字。根据这两条可判断，答案为C。