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：布萊克先生在我們做實(shí)驗(yàn)的時(shí)候在我們身邊走來(lái)走去提供幫助。A. while正當(dāng)……時(shí)候；B. although盡管；C. until到……為止；D. unless除非，如果不。while與進(jìn)行時(shí)態(tài)連用，故答案為A。
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