- 试题详情及答案解析
- He failed the mid-term examination and only then _______ how much time he had wasted.
| A．had he realized | B．did he realize |
| C．he had realized | D．he realized |
- 答案：B
- 试题分析：考查only的用法辨析。句意：他在期中考试中失败了，直到那时他才意识到自己浪费了多少时间。Only引导的句子，若only位于句首，则从句用半倒装结构。由failed可知，动作发生在过去，用一般过去时。故选B.
考点：考查only的用法