—Whatdoyouthinkofthegrammarbook?—Oh,itreallyis

问题详情：

 —What do you think of the grammar book?

— Oh, it really is ________ useful reference book, which is worth reading ________ second time.

A. a; a                      B. an; the                 C. an; a                    D. the; the

【回答】

A

知识点：冠词

题型：选择题