单选题 How the customers ______ in the restaurant affected their evaluation of the service.
A. are treated B. will be treated
C. treated D. were treated

【正确答案】 D

【答案解析】[解析] 该题考查时态和语态，本句为主语从句，How the customers ______ in the restaurant作整个复合句的主语，the customers(顾客)与treat(对待)是被动的关系，所以排除C项。另外，要与主句的谓语动词affected时态保持一致，所以只能用一般过去时。