几道英语疑难选择题

1、----Imagine you are outside when ( ) earthquake comes. what should you do?

----Go to ( ) open space away from buildings or trees.

A、the the

B、the an

C、an the

D、an an

2、The house ( ) for about 10 minutes by the time the firefighters arrived.

A、has caught fire

B、had caught fire

C、has been on fire

D、had been on fire

请说详细点理由，非常谢谢

A. earthquake和open space 前习惯加定冠词。

D 过去完成时的用法，但要注意不能选B,因为句中有一段时间的短语，不能与短暂性动词caught连用。

1.B earthquake是名词 前面要加the或an 又因为这个地震是特指的 所以用the

2.D 时态是过去式 所以先排除AC 又因为现在完成时，所以选D