4个简单选择```````问题严重.....急

I lost my purse on the way home,That was ____ I looked sad.

A because

B so

C why

D how

[选择A吗?表示"这是我悲伤的原因"???]

We didn't know ____ to do it.

A what

B how

C which

D why

[选B?如何做?]

What happened to Mary's brother?

He ____ off while he ___ a bike.

A ws falling;rode

B fell;was riding

C falls;is riding

D was falling;was riding

[选D???]

Hurry up,____ you'll be late for school

A but

B and

C or

D so

[选择or?不然你就会迟到??]

CThat was why ...这是我悲伤的原因,why 引导 表语从句

B how to do it，表方式，如何...

B fell;was riding 正在骑车时摔了下来

C or 否则的话

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