问题
Jim is honest boy in my class. He bought me _____ useful book as abirthday present.
A:a, an
B:an, a
C:a, a
D:an, an
B:an, a
C:a, a
D:an, an
正确答案是：
同类题型
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I think ____ of the materials I listened to at the beginning of the exam ____ easy.
_______ do you help the old man with the housework?-Once a week. [ ]