单项选择 较易0.85 引用1 组卷106
________ cloning may be used for medical treatment, everyone doesn’t support it.
| A．While | B．As |
| C．Since | D．Unless |
18-19高二上·江苏宿迁·期末
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It is said that the fire on Sunday night lasted about three hours ________ the firefighters came.
| A．before | B．until | C．when | D．after |
My friend walked me to the bus stop and waited with me______________ the bus arrived.
| A．once | B．unless | C．when | D．until |
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