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【多选题】
关于Set接口说法正确的是______。A.
Set是Collection的子接口
B.
HashSet实现了Set接口
C.
Set接口是为了保持集合框架的层次性而设置的
D.
Set接口没有扩展Collection接口
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【单选题】Jim, the newly elected director, had to reorganize the entire office he angrily complained of his ______, who had been so incompetent that everything was left in a mess.
A.
successor
B.
ancestor
C.
predecessor
D.
forefather
【单选题】Jim, the newly elected director, had to reorganize the entire office; he angrily complained of his _________, who had been so incompetent that everything was left in a mess.
A.
successor
B.
ancestor
C.
predecessor
D.
forerunner
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