21.D.although表示让步关系.
22.B.while表示让步关系,“尽管”.
23.C.as引导让步状语从句时,要将表语,状语或部分谓语动词提到as的前面.
24.D.seeing that的意思是“由于,因为,鉴于”.
25.C.so that引导结果状语从句.
21.____ most of the earth’s surface is covered by water,fres
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