_______ his return from America, he got down to his research


  1. A.
    While
  2. B.
    In
  3. C.
    As
  4. D.
    On
D
試題分析:考查固定句型結(jié)構(gòu)。on+n/v-ing表示”一....就”。句意:他一從美國(guó)回來(lái),就著手他的研究。故選D。As作介詞時(shí)意思是“作為”,while不能做介詞。
考點(diǎn):考查固定句型結(jié)構(gòu)。
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