Question

 Bob called to tell his mother that he couldn’t enter the house, for he ______ his key at school.

A. had left                       B. would leave               C. was leaving            D. has left

Answer 1

 答案：A

解析：題干意思是：鮑伯打電話給他的媽媽說他不能進(jìn)房子，因?yàn)樗�把鑰匙忘在學(xué)校了。本句中的called標(biāo)明動(dòng)作發(fā)生在過去，而在電話之前忘記拿鑰匙，所以應(yīng)用had left表示過去的過去的動(dòng)作。