______whether robots will one day have vision as good as human vision.

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问题 ______whether robots will one day have vision as good as human vision.

选项 A、What is not yet known
B、It is not yet known
C、As is not yet known
D、This is not yet known

答案B

解析 It is(not)known…为常用句式，意为“目前还不知道”，其中it为形式主语，后面的从句才是真正的主语。故选B。

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