【題目】____carefully for a long time, the opening was a great success

A. To have been prepared

B. Having been prepared

C. To be prepared

D. Being prepared

【答案】B

【解析】試題分析:句意：認(rèn)真準(zhǔn)備了很長時(shí)間，這次開幕式很成功。根據(jù)句意可知人們是在開幕式前進(jìn)行準(zhǔn)備工作，是過去發(fā)生的事情，應(yīng)該用現(xiàn)在分詞的完成式形式，選B。

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