题文
Only when he put his foot into the river________that the water was too cold to swim in.
| A．he realized | B．did he realize |
| C．had he realized | D．he had realized |
推荐试卷
Only when he put his foot into the river________that the water was too cold to swim in.
| A．he realized | B．did he realize |
| C．had he realized | D．he had realized |
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