Don’t touch anything in the lab unless.A. to be allowed B. allowed C, to be allowing D.all

发布时间：2020-08-17 12:02:13

Don’t touch anything in the lab unless    .
A. to be allowed          B. allowed         C, to be allowing  D.allowed to

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解析：考查从句省略。完整的句子是：unless you are allowed to touch
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