—I'm not sure _________there are living things on the planets or not.—Even scientists aren't sure about it.[ ]A. whether B. where C. why D. what-初中英语-n多题

◎ 题干

—I'm not sure _________there are living things on the planets or not.
—Even scientists aren't sure about it.

[ ]

A. whether
B. where
C. why
D. what

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◎ 解析

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