If Mars no air or water, we will not survive there.

A. will have B. would have C. has D. is having

C 【解析】句意：如果火星沒(méi)有空氣和水，我們將在那里無(wú)法生存。If引導(dǎo)的是條件狀語(yǔ)從句，不能用一般將來(lái)時(shí)，而用一般現(xiàn)在時(shí)來(lái)代替。這里符合主將從現(xiàn)的原則，Mars是第三人稱單數(shù)，所以用has，故選C。
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