—I’m not sure ______there are living thi...

—I’m not sure ______there are living things on other planets or not .

—Even scientists aren’t sure about it.

A．where B. why C. what D. whether

D 【解析】试题分析：句意为：---我不确定在其他星球是否有生物。---即使科学家对此也不敢肯定。where：在哪里， why：为什么， what：什么， whether：是否。这是一个宾语从句。根据语境，whether---or not是固定搭配。故选D。考点：考查固定搭配。

考点分析：

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