问题
选择题
—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
答案
答案：A
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—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
答案：A