Q: 用 as...as将下面两个句子写成比较句
Mark is a good athlete.
Bill is a good athlete.
A) Mark is as good an athlete as Bill is.
B) Mark is an athlete as good as Bill is.

你的语感是B，但外国人习惯说A。文法书上也是教A(可见他们常这样用)，你可把这样的用法当成句型

我觉得在中间加逗号，然后如你说的去掉is，应该可以。

谢谢V大指点!谢p大:正在练习的是一句完成比较，虽然非限定听起来挺顺