---Isthatyourlibrary---Yes,andit'___oldthing.A.aB.anC.theD./
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题目内容：
---Is that your library ---Yes,and it'___old thing.
A.a B.an C.the D./
优质解答
---Is that your library
---Yes,and it's ___ old thing.
A.a B.an C.the D./
答案：B
解析：old 为元音音素,所以要用 an
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