问题补充:
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:
A. are; hasn’t been built
B. are; has built
(答案→)C. is; haven’t been built
D. is; have built
解析: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。