单选题 Please sign up as soon as possible for the ______ of the museum because there are a limited number of seats available
A. sight B. walk C. tour D. trip

【正确答案】 C
【答案解析】[解析] 句子要表示“参观博物馆”C意为参观，观光，并和介词of构成短语，故为正确答案。