Mr. Bryan is a/an secretary in our office, for he is able to do tasks successfully, without wasting time or energy.
A. effective
B. efficient
C. flexible
D. sufficient
网友回答
A. effective
(答案→)B. efficient
C. flexible
D. sufficient
解析：考查形容词辨析。A有效的；B高效的；C灵活的；D充分的；句意：在我们办公室里，Mr. Bryan是一个很高效的秘书，因为他总是不浪费时间和精力成功第完成了任务。根据句意说明B正确。