问题描述：
关于within的类动式用法
The new power station is reported_________within three years.
A.to completed B.having been completed C.to have completed
D.to have been completed
为什么选A啊,
The new power station is reported_________within three years.
A.to completed B.having been completed C.to have completed
D.to have been completed
为什么选A啊,
问题解答：
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