________whether he will one day achieve his life goal. However, he is confident that he will.

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问题 ________whether he will one day achieve his life goal. However, he is confident that he will.

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/was (not) known+从句”为固定结构，意为“(不)知道……”。第一句中It作形式主语，后面whether引导的主语从句才是真正的主语。故选B。

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