- 试题详情及答案解析
- It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．
| A．when; which | B．when; that |
| C．that; which | D．that; that |
- 答案：B
- 试题分析：考查连词搭配。前半句为非限制性定语从句，先行词为1911表示时间且，应是在1911年，故应用when，第二空考查强调句it is not until….that…直到…才…，句意：直到1911年，第一个维他命被发现，人们才意识到它的重要性。故选B
考点：考查连词搭配