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

◎ 题干

—I'm not sure _____ there are living things on other planets or not.
—Even scientists aren't sure about it.

[ ]

A. whether
B. where
C. why

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