Question

An American scientist and writer _______ coming to give us a lecture on English learning methods when he visits our school

1. A.
   was
2. B.
   were
3. C.
   is
4. D.
   are

Answer 1

C
考查时态及主谓一致。句意：当他参观我们学校时，一位美国科学家兼作业来给我们做一场关于英语学习方法的演讲。结合语境可知本句描述的是客观存在的事实，故用一般现在时态。联系下文可知科学家和作家指的是一个人，故谓语动词用单数，选C。