单选题 Before the final examination, the teacher told the student: "Two hours ______ the limit of the test."
A. are B. has been C. would be D. is

【正确答案】 D
【答案解析】[解析] 本题考查的是主谓一致。当表示时间、度、量、温度、金钱等复数名词作主语表示一定的量或总和时，谓语一般用单数形式。