举报
at speeds (that are) much higher than (speeds) are currently possible这样才平行
D. at much higher speeds than that
E. at speeds much higher than are DE的的比较对象不同,楼主仔细体会一下,如果用D的形式,那应该是at much higher speeds than at ......;而E只是对形容词high的比较。
明白了, 分析得很好.
AB前面用with都是錯的
用at speed
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