- How many of you have solved the math problem? the math problem is far too diffic

问题补充：

--- How many of you have solved the math problem?

--- , the math problem is far too difficult for us to work out. .

A. All

B. None

C. Nobody

D. Everybody

答案：

A. All

(答案→)B. None

C. Nobody

D. Everybody

解析：句意：---你们中有多少人已经解出了这道数学题呢？---没人，这道数学题对我们来说太难。四个选项中，只有none可以回答How many的提问，故选B。

考点: 考查代词的用法。