问题
选择题
The number of the people who can afford to buy their own house ______ more than 60%,but a number of houses _______.
A．are; hasn’t been built
B．are; has built
C．is; haven’t been built
D．is; have built
答案
答案：C
考查：The number of +复数名词做主语，谓语动词用单数，a number of +复数名词做主语，谓语动词用复数，故选C。