There is useful book and interesting magazine on the desk. They aremy brother’s.A. a an

问题补充：

There is useful book and interesting magazine on the desk. They aremy brother’s.

A. a, an, all

B. a, a, both

C. a, an, both

D. an, a ,all

答案：

A. a, an, all

B. a, a, both

(答案→)C. a, an, both

D. an, a ,all

解析：

useful中的首字母u发的是/ju/非元音，故用a；而interesting中首字母i发的是/?/为元音，故用an；这里只有两本书，故用both，而all用于三者及以上，故选C。