when:you should be careful when _____ the street in big cities.选项_英语解答

when:you should be careful when _____ the street in big cities.
选项是:a.to cross b.cross c.crossing d.crossed
这个题目为什么选c呢?

人气：203 ℃　时间：2020-03-25 03:30:37

解答

C
这句话其实相当于在the street之前省略了“you are".
把you are加进句子中,你就发现只能选C.