问题
There is ________“s” and ________“f”in the word “useful” .
A:an, a
B:a, an
C:an, an
D:a, a;
B:a, an
C:an, an
D:a, a;
正确答案是：
同类题型
Have you been to New Zealand?— No, I’d like to, ________ [ ]
I have ________ in learning English and I’m so worried. Could you help me with it—Sure.
I am tired ________ the partner I have been working with; he is too hard a person ________.
______ school playgrounds to the public makes exercise easier for the people in the community.