题目内容
---What ________ useful book it is!
---Yeah, it tells us how to play ________ piano.
A. an, the B. a, / C. a, the D. an, /
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题目内容
---What ________ useful book it is!
---Yeah, it tells us how to play ________ piano.
A. an, the B. a, / C. a, the D. an, /