题目内容
桾his is ________ useful book, I think.
桽o it is, and it's ________ unusual one.
A. an; / B. an; an C. a; an D. a; a
答案:C
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题目内容
桾his is ________ useful book, I think.
桽o it is, and it's ________ unusual one.
A. an; / B. an; an C. a; an D. a; a