It's no longer a question now _____ man can land on the moon.A.whenB.thatC.whetherD.howC为什么不行.

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It's no longer a question now _____ man can land on the moon.A.whenB.thatC.whetherD.howC为什么不行.
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It's no longer a question now _____ man can land on the moon.A.whenB.thatC.whetherD.howC为什么不行.
It's no longer a question now _____ man can land on the moon.
A.when
B.that
C.whether
D.how
C为什么不行.

It's no longer a question now _____ man can land on the moon.A.whenB.thatC.whetherD.howC为什么不行.
因为主句有 no longer ,即“已不再是个问题”,可见不带有任何不确定的意思,此时一般用that.
比较:
It is a question whther he will come here tomorrow.
此句“他明天来与不来”带有不确定性,故用whether
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