（2013·安徽卷)From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
| A．why | B．how | C．because | D．whether |
相关试题
The teacher apologized late.
| A．to his students to arrive | B．to his students for arriving |
| C．at his students to arrive | D．at his students for arriving |
----May I open the win
dow to let in some fresh air?
----
A. come on! B Take care! C Go ahead! D Hold on
It took me a long time before I was able to fully appreciate what they _____ for me.
| A．had done | B．did | C．would do | D．were doing |
He had a wonderful childhood, _____ with his mother to all corners of the world.
| A．travel | B．to travel | C．traveling | D．traveled |
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