They didn't start work________their teacher came back．


  1. A.
    until
  2. B.
    while
  3. C.
    as soon as
  4. D.
    if
A
分析：不能用while，因?yàn)閯?dòng)詞是came；不能用as soon as，因?yàn)橐馑疾煌�；不能用if，因?yàn)闀r(shí)態(tài)不對；要用until，句意是“他們直到老師回來才開始工作�！笔褂胾ntil時(shí)注意：1)否定句時(shí)表示“不做某事，但到了until所指的時(shí)間，原來不做的事情要開始做”，可以解釋為“直到……才……”，由于中文的結(jié)構(gòu)中沒有用否定，因此在做中譯英時(shí)會把應(yīng)該做否定句的句子翻譯成肯定句。2)肯定句表示“一直做某事，但到了until所指的時(shí)間就要停止不做”。既然是一直做某事，因此在肯定句里的動(dòng)詞必須表示延續(xù)性的動(dòng)作。
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