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        1. Tom’s mother is busy _____ breakfast for Tom.
          A.cookB.to cookC.cooksD.cooking
          D
          原形動詞和第三人稱單數(shù)形式動詞不能用在be動詞后,不定式表示將要發(fā)生的動作,動名詞表示正在發(fā)生的動作,根據(jù)題意選D,湯姆的媽媽正在忙著為他準備早飯。
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