18、Genetics is a science that had already caused and        great changes in our lives.

A．will cause        B．caused      C．was causing     D．had caused

18、A

請在這里輸入關(guān)鍵詞：
相關(guān)習題

科目：高中英語 來源： 題型：

Genetics is a science that had already caused and        great changes in our lives.

A．will cause        B．caused      C．was causing     D．had caused

查看答案和解析>>


同步練習冊答案