– Amazing! You _____ have won the first prize in the national English speech contest!
– I’m lucky that all my efforts have finally paid off.  
A．mustB．mayC．canD．should
D 

試題分析：--真是令人驚訝！你竟然在全國(guó)英語演講比賽中獲得一等獎(jiǎng)！--我很幸運(yùn)所有的努力都最終有了回報(bào)。Should have done表示驚訝的語氣，must have done過去一定做了，may have done過去可能做了，can have done用于疑問或否定句中，選D。
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