Question

【题目】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】题干意思是：鲍伯打电话给他的妈妈说他进不了家门，因为他把钥匙忘在学校了。本句中的called表明动作发生在过去，而在打电话之前忘记拿钥匙，所以应用had left表示动作发生在过去的过去。