I’m sorry that I cannot accept your ________ to attend your birthday party, Linda, because I was ________ to answer all the customers’ letters tonight by my boss．A.requirement; requiredB.demand; requestedC.request; askedD.request; required
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D解析第一个空表示邀请或请求，用request；第二个是老板的要求，用required。requirement指要求的事物，多用复数。