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：
考查狀語從句的省略。當狀語從句的主語和主句的主語一致的時候，可以把狀語從句的主語和系動詞一起省略，本題if的后面省略了they are.句意：如果沒有被小心處理，小小的船很容易就會翻掉。故A正確。
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