单选题 Because of the close ______ of architects and builders, the building was completed ahead of schedule.
A. simulation B. composition C. collaboration D. inflation

【正确答案】 C
【答案解析】[解析] (collaboration合作)。句意为：由于建筑师和建筑工人密切合作，该大楼提前完工。A．simulation模拟；B．composition写作，作曲；D．inflation充气，膨胀。