【題目】But for the survival instinct that nearly all creatures have, more species from the earth.

A. could disappear B. might have disappeared

C. should disappear D. will have disappeared

【答案】B

【解析】考查虛擬語氣。句意：如果不是所有物種都具備的生存本能，更多的物種可能已經(jīng)從地球消失了。根據(jù)句意可知，此句使用了虛擬語氣的結(jié)，根據(jù)句意可知虛擬過去，故選B。

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