题目内容
This was the period ________ he first began the research and studies.
- A.when
- B.that
- C.which
- D.for which
A
练习册系列答案
相关题目
------I didn't know this was a one-way street in Dalian, officer.------_______
|
A.That's all right. |
B.I don't believe you. |
|
C.How dare you say that? |
D.Sorry, but that's no excuse. |