单项选择 适中0.65 引用1 组卷285
The students can’t go home_______they finish cleaning the classroom.
| A．when | B．since | C．if | D．until |
17-18八年级上·辽宁盘锦·期末
类题推荐
It has been 15 years since the terrible earthquake ________ in Wenchuan.
| A．had happened | B．has happened | C．happened |
Some animals are in danger of dying out. Therefore, effective measures must be taken________ it is too late.
| A．after | B．when | C．until | D．before |
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