________ time went by, small clever animals covered the earth and have become the most important animals on the planet.
A．WithB．AsC．BecauseD．During
B
本題考查連詞。With介詞，隨著，接名詞； As由于，隨著，接從句；Because 因?yàn)�，接從句；During在期間。句意：隨著時(shí)間流逝，聰明的小型動(dòng)物覆蓋了地球并成為這個(gè)星球上最重要的動(dòng)物。as在句中是“隨著……”的意思，故選B。
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