---Each of the 400 people received from their boss_______ gift---“Who moved my cheese?”---_______ best-seller in the US---to understand how to deal with changes in their lives and work.A.the; 不填B.a；aC.a；不填D.the；a
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B解析考查冠词的用法。前者表示数量“一个”，后者表示种类“一种（非常畅销的书）”。