23. -Have you learned German?
-Yes. It's ___ language I've ever learned.
A. a quite difficult B: quite a difficult
C. difficult quite D. difficult a quite
24. I’m afraid I’ll turn to Prof. Timlingson. It is .
A. too difficult a problem B. a too difficult problem
C. so difficult problem D. a so difficult problem
要么前面加上冠词, 要么前面加上指示代词或物主代词,要么用为复数。
This is pen. (错误。pen是可数名词单数,不能单独使用。)可改为:
This is a pen.
This is the pen.
This is his/her/my/their pen.
This is that pen.
These are pens.
25. --- Hey, Mr. Smith, you are wanted
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