单项选择 适中0.65 引用1 组卷161
We had just begun to work________ the machine broke down.
| A．when | B．as | C．while | D．after |
20-21高一下·甘肃兰州·期末
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Nearly three months had gone by _________ the seriously injured girl showed a slight sign of recovery.
| A．until | B．before |
| C．since | D．after |
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