【題目】Mr Brown is a（n）__________ secretary in our office, for he is able to do tasks successfully, without wasting time and energy.

A. effective B. efficient

C. flexible D. sufficient

【答案】B

【解析】句意：布朗先生在我們辦公室是一個高效的秘書。他能成功地完成任務(wù)，而不浪費時間和精力。effective有效的；efficient有效率的；flexible靈活的；sufficient足夠的，充足的。

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