题目内容
Mr Black walked around and offered help____we were doing an experiment.
A. while B. although C. until D. unless
A 【解析】句意：布莱克先生在我们做实验的时候在我们身边走来走去提供帮助。A. while正当……时候；B. although尽管；C. until到……为止；D. unless除非，如果不。while与进行时态连用，故答案为A。
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