A curve is a line ______ no part is straight and which has no angle.

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问题 A curve is a line ______ no part is straight and which has no angle.

选项 A、that
B、whose
C、in which
D、of which

答案D

解析 “介词+关系代词”可引导定语从句。因为句中有短语“no part is straight”,因此用of which,而不用in which。whose和that在此都不符合语法结构。
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