注意：此页面搜索的是所有试题
题目内容
（兰州工业学院大学英语1）
【单选题】It is the effects of motor car _ has been respnsible for many changes in the enviroment.
A、that
B、what
C、this
D、why
A、that
B、what
C、this
D、why
参考答案