问题
I think this is ______ useful book.
A:a
B:an
C:the
D:/
B:an
C:the
D:/
正确答案是：
同类题型
When did Mr. Smith come here? —________ nine o’clock yesterday morning. [ ]
It is time ______ Li Ming ______ his report.[ ]
Tom and Jenny are in the same school. And _________ like sports very much.
How long can I _____ the book?–Three weeks.
In order to let more people pay attention to their plan, they _________ some signs on the wall.