[单选题]The students were talking and laughing（）the teacher came in.

while

after

since

when

正确答案：D

题目解析

如果选since主句要用完成时，不符合。老师进来之后学生不讲话了不用进行时，不选after。while表示两件事情同时发生。选D。句意：老师进来时，学生们在谈笑风生。

最新题目

扫描二维码
免费搜题、免费刷题、免费查看解析

[单选题]The students were talking and laughing（ ）the teacher came in.