Question

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

Answer 1

A
解析：
考查状语从句的省略。当状语从句的主语和主句的主语一致的时候，可以把状语从句的主语和系动词一起省略，本题if的后面省略了they are.句意：如果没有被小心处理，小小的船很容易就会翻掉。故A正确。