20 The direction _______ a force acts is changeable.A. at which B. to which C. in which D. on which

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20 The direction _______ a force acts is changeable.
A. at which B. to which
C. in which D. on which

选D.
主要就是一个词组的介词搭配.
力作用于方向:a force acts on the direction.在句子中 on which a force acts 做The direction的定语,=that\which a force acts on.
act on ...作用于
全句的意思是:力可以改变方向.

D