并列结构作主语时当意义为复数时谓语用复数

并列结构作主语时当意义为复数时谓语用复数：

注意: 当主语由and连结时,如果它表示一个单一的概念,即指同一人或同一物时,谓语动词用单数,and 此时连接的两个词前只有一个冠词.

The iron and steel industry is very important to our life.

The League secretary and monitor ___ asked to make a speech at the meeting.

A. is B. was C. are D. were

答案B. 注: 先从时态上考虑.这是过去发生的事情应用过去时,先排除A.,C..本题易误选D,因为The League secretary and monitor 好象是两个人,但仔细辨别, monitor 前没有the,在英语中,当一人兼数职时只在第一个职务前加定冠词.后面的职务用and 相连.这样本题主语为一个人,所以应选B.