题目内容

2. I don’t know what has happened, and don’t know what to do next.

A. 对
B. 错

查看答案

搜索结果不匹配？点我反馈

更多问题

3. However he managed to finish the task.

A. 对
B. 错

4. He is five and she is seven.

A. 对
B. 错

5. John, for instance, believes that we will win the game.

A. 对
B. 错

烯烃可与卤化氢在双键处发生加成作用，生成相应的卤代烷。

A. 对
B. 错