中文谷Don'tcomeintothelab
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问题详情：
Don't come into the lab __ __ you are asked to.
A．unless B．until C．because D．since
【回答】
A
知识点：连词
题型：选择题
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问题详情：
Don't come into the lab __ __ you are asked to.
A．unless B．until C．because D．since
【回答】
A
知识点：连词
题型：选择题
