—May I go outside and play for a while, Dad?
—No, you can’t ____ your homework is being done.
A．untilB．a(chǎn)sC．beforeD．the moment
B
考查連詞;A. until直到B. as 當(dāng)…時候，因為C. before在…之前，D. the moment一…就，句意：--我可以出去玩一會嗎？--不，你不能，因為你正在做作業(yè)。選B。
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