20 The direction _______ a force acts is changeable.
A. at which B. to which
C. in which D. on which
人气：451 ℃ 时间：2020-05-12 07:12:36
解答
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....
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