- 试题详情及答案解析
- The number of air crashes that _______ in developing countries _________ increasing.
| A．happens; is | B．happen; is |
| C．happens; are | D．happen; are |
- 答案：B
- 试题分析：考查主谓一致，第一个that 后面为定语从句，缺少谓语，主语为air crashes,故谓语动词用复数形式happen;第二空主语为the number of意为“．．．的数量”，谓语动词用单数形式is。句意：发生在发展中国家的飞机失事事件正在增加。
考点：考查主谓一致