题干

—What do you think of the grammar book?
—Oh, it is really _____useful reference book, which is worth reading _____second time.
A.a, aB.an, the
C.an, aD.the, the
上一题 下一题 0.64难度 单项选择 更新时间:2015-04-07 09:14:19

答案(点此获取答案解析)