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问题: waste的用法

I am not wasting my time ______.
A:walking home
B:by walking home
答案:A
why?

解答:

我们应该说I am not wasting my time walking home.因为waste的搭配是waste sth. on sth./doing sth. 如果用doing前面的介词on可以省略。waste搭配by只用于下面情况:His body was wasted by long illness.他的身体因久病而衰弱了。