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A curve is a line ______ no part is straight and which has no angle.
A.thatB.whoseC.in whichD.of which
D

试题分析:句意:曲线是一条线它没有部分是直的而且没有角。这里是定语从句先行词是a curve,定语从句中是no part of the curve is straight,所以缺少介词of+关系代词(which),所以选D.
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