【題目】火星上有沒(méi)有人類還不確定。
is uncertain on Mars.

【答案】It;whether there are human beings
【解析】it作形式主語(yǔ),whether“是否”引導(dǎo)主語(yǔ)從句作真正的主語(yǔ),根據(jù)句意從句使用一般現(xiàn)在時(shí)。故填(1). It (2). whether there are human beings。

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