Professor Smith will come here to give a speech．All the preparations must be________before 5 o'clock．（ ?。?/h1>
【考點(diǎn)】介詞短語(yǔ)．
【答案】C
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/4/20 14:35:0組卷：41引用：4難度：0.6
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