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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

試題分析：句意：曲線是一條線它沒有部分是直的而且沒有角。這里是定語從句先行詞是a curve，定語從句中是no part of the curve is straight，所以缺少介詞of+關系代詞（which），所以選D.
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