问题: 语法综合练习5
We could hear him walking about upstairs _____ his heavy boots.
A. in B. on C. at D. by
请详细写出解题的过程和思路。
解答:
选择:b
by有个用法是:used for showing how or in what way sth is
done。意识是说,by可以用来表示方式
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