单选题 Customer: Could you hold the door open for a moment, please?
Salesman: Certainly. ______.
【正确答案】 A
【答案解析】[解析] 此处的语言功能为请求和肯定答复。A项“Please take your time”意思为“不着急!您慢点儿!”,最符合语境。B项“I"m sorry I can"t”与前面的肯定答复“Certainly”自相矛盾;C和D项表达法都用来回应道歉,在这里使用不符合语境。