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问题: 有个问题想问下

25.after ___ was about ten minutes, the teacher gave the students the correct answer to the question.
a. that b.it c.which d.what为什么选D,我觉得B也可以呀,解释并翻译,

解答:

after ___ was about ten minutes, the teacher gave the students the correct answer to the question.
a. that b.it c.which d.what
答案:D
译文:过了大约10分钟,老师给了学生们这个问题的正确答案.
解析:after是介词,后面要接名词。由于没有先行词,不考虑定语从句,可排除A、C。
故按名词性从句来处理。很显然was是从句中的谓语动词,前面缺主语,需要填代词。what是代词,所以选what。
不用it,因为it无此指代用法。
这块可以理解成是介词后面的名词性从句。


参考文献:新东方英语