Small sailboats can easily turn over in the water ________.


  1. A.
    if not managed carefully
  2. B.
    if are not managed carefully
  3. C.
    unless not managed carefully
  4. D.
    unless are not managed carefully
A
解析：
考查狀語(yǔ)從句的省略。當(dāng)狀語(yǔ)從句的主語(yǔ)和主句的主語(yǔ)一致的時(shí)候，可以把狀語(yǔ)從句的主語(yǔ)和系動(dòng)詞一起省略，本題if的后面省略了they are.句意：如果沒(méi)有被小心處理，小小的船很容易就會(huì)翻掉。故A正確。
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