What useful book! And book is popular with students.A. a; aB. an; aC. the; theD. a; the

What useful book! And book is popular with students.
A. a; a
B. an; a
C. the; the
D. a; the

A. a; aB. an; aC. the; the(答案→)D. a; the解析：句意：多么有用的一本书啊！这本书很受学生们的欢迎。不定冠词a/an泛指“一个、一本……”用于修饰单数可数名词，而useful是以辅音音素开头，所以要选用a;对于上文中已经出现过的人或事要用定冠词the。结合句意，故选D.

就是这个解释