Sorry, I have no time left now. Can we discuss the matter ________ supper?
A．overB．onC．byD．a(chǎn)t
A

試題分析：考查介詞用法。Over超過，在…期間；句意：我現(xiàn)在沒有時(shí)間了，我們能不能在晚飯的時(shí)候討論這個(gè)問題？故A正確。
點(diǎn)評(píng)：本題中的Over超過，在…期間。要昨天介詞的一詞多義的現(xiàn)象。
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