问题
选择题
Small sailboats can easily turn over in the water ________.
A．if not managed carefully
B．if are not managed carefully
C．unless not managed carefully
D．unless are not managed carefully
答案
答案：A
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。