When he was born and where he grew up ____ still unknown

来源：百度知道编辑：UC知道时间：2024/05/16 13:08:10

a. is b. are c. was d. be
选B，这样用单复有什么规律？

"When he was born and where he grew up" 这两个对象，are still unknown。

这句话意思是“他在哪生的和在哪长大的”这两件事还是未知的。因为是两件事，复数，所以用are。如果是"when he was born"就用“is still unkown”了。

you should choose B.are
I have the same opinion with flashingair

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