---Excuse me,Sir.Do you have the time?---.A. Yes,I do.B. No problemC. Half past twelveD. C

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A. Yes,I do.
B. No problem
(答案→)C. Half past twelve
D. Certainly,I have.
解析：Yes,I do.是的，我……；No problem 没问题；Half past twelve十二点半；Certainly,I have.当然，我……。根据上文，打扰了，先生。你有时间吗？结合语境可知选C。