You should understand the traffic rule by now. You’ve had it ________ often enou

题型：不详难度：来源：

You should understand the traffic rule by now. You’ve had it ________ often enough.

A．explaining

B．to explain

C．explain

D．explained

答案

D

解析

试题分析：考查宾语补足语。本句的it指代the traffic rule，与explain构成被动关系，故使用过去分词的形式。句意：到现在为止你应该能理解交通规则，我已经和你解释足够多次了。故D正确。
点评：考查宾语补足语也要注意动词与宾语的关系，如果二者构成主动关系就使用现在分词，如果构成被动关系就使用过去分词。