题目内容
_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.
| A．What | B．It | C．As | D．Which |
A
解析试题分析：句意：众所周知的是应该采取有效的措施来处理过度开采资源的问题。分析句子成分可知，第二个is是谓语，前面的句子是主语从句，因为主语从句缺少主语，所以用what连接主语从句，It做的是形式主语，那么后面的is就要去掉，as引导的是非限制性定语从句，is就要改成逗号，which也是引导非限制性定语从句。选A。
考点：考查主语从句
阶梯计算系列答案-I've left my watch in the hotel.
-I ______ and get it for you
| A．go | B．am going | C．am to go | D．will go |
Don't press the red button ,_______you will set off the alarm.
| A．but | B．or | C．so | D．and |
Sitting under the willow trees ____ an old man.
| A．is | B．are | C．is there | D．are there |
The weather turned out to be very good, was more than we could expect.
| A．what | B．which | C．that | D．it |
He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.
| A．why | B．how | C．because | D．whether |
Doctors have been researching effect stand-up and other forms of comedy have on us.
| A．which | B．what | C．whatever | D．whichever |
If the weather is fine, we’ll go. If ______, ______.
| A．not; not | B．no; no | C．not; no | D．no; not |
_______ one of you breaks the windows will have to pay for it.
| A．Whichever | B．Whatever | C．Whoever | D．Wherever |