A ship in the harbor is safe but that’s not ships are built forA. whatB. thatC. whyD. ho

问题补充：

A ship in the harbor is safe，but that’s not ships are built for．

A. what

B. that

C. why

D. how

答案：

(答案→)A. what

B. that

C. why

D. how

解析：句意：港口的船是安全的，但是这不是建轮船的目的。这里是表语从句，表语从句中for缺少宾语，用what连接表语从句，that连接表语从句的时候，不做成分，why为什么，how怎么，所以选A。