Question

【题目】Mr Liu is ____ unusual teacher．He has written _____ useful book for his students.

A．an; an B．an; a

C．a; a D．a; an

Answer 1

【答案】B

【解析】

试题分析：考查不定冠词的用法。句意：刘先生是个不寻常的老师，他为学生们写了本有用的书。Unusual是元音开头的用an修饰，useful是以辅音开头的用a修饰，只有B符合题意。故选B。