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[单选题]
句子中的as是什么意思? As we were listening to the radio, someone knocked at the door.()
A.in the position of
B.because
C.At the time whe
D.the thing that
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A.in the position of
B.because
C.At the time whe
D.the thing that
A.楚國方城以爲城,漢水以爲池
B.數罟不入袴池,魚鱉不可勝食也
C.南冥者,天池也
D.花林曲池,園園而有
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