The peaks of a mountain range, acting like rocks in a streambed,produce ripples in the air flowing over them: the resulting flow pattern, with crestsand troughs that remain stationary although the air that forms them is movingrapidly, are known as “standing waves.” (A)crests and troughs that remain stationary although the air that forms them ismoving rapidly, are (B)crests and troughs that remain stationary although they are formed by rapidlymoving air, are (C)crests and troughs that remain stationary although the air that forms them is movingrapidly, is (D)stationary crests and troughs although he air that forms them is movingrapidly, are (E) stationary crests and troughs althoughthey are formed by rapidly moving air, is
答案选C
根据主谓一致可以排除ABD
下面CE该怎么选呢?rapidly moving 表达是否正确?moving是动名词么,能用rapid形容词来修饰吗?
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