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驗的時候在我們身邊走來走去提供幫助。A. while正當……時候;B. although盡管;C. until到……為止;D. unless除非,如果不。while與進行時態(tài)連用,故答案為A。
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