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 crests and troughs that remmain stationary although the air that forms them is moving rapidly,are known as "standing waves"
(A)crests and troughs that remmain stationary although the air that forms them is moving rapidly,are
(B)crests and troughs that remmain stationary although they are formed by rapidly moving air,are
(C)crests and troughs that remmain stationary although the air that forms them is moving rapidly,is
(D) stationary crests and troughs although the air that forms them rapidly,is
(E) stationary crests and troughs although they are formed by rapidly moving air,is
我知道ABD主詞和動詞不一致
然後解答還說DE因為although副詞子句修飾介詞片語with stationary crests and troughs 我不懂耶 除此之外還有其他的錯誤地方嗎