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问题: 谢谢~帮忙看一下~

Mary ran _______ her sister while she was shopping in the city.
A.over B.after C.into D.down
答案选C,为什么?

解答:

run across (v.+ adv)无意间碰到

run into (v.+prep.)偶遇,撞上,达到

这两个词组的意思基本相同,但组成的方法不同,一个是动词加副词,另一个是动词加介词