题目内容
─ What are you writing on?
─ I'm writing on .
[
]A
. a paper B.a pieceC
. a paper D.a piece of paper
答案:D
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题目内容
─ What are you writing on?
─ I'm writing on .
[
]A
. a paper B.a pieceC
. a paper D.a piece of paper