His father is      engineer. He designed such     useful machine    
A.a(chǎn) anB.a(chǎn)n aC.a(chǎn)n anD.a(chǎn) a
B

試題分析:句意:他爸爸是個工程師,他設(shè)計了很有用的機(jī)器。Engineer 讀音以元音開頭,用冠詞an;useful讀音以輔音開頭,用冠詞a;故選B。做這類題要看單詞的讀音是以元音還是輔音開頭,不能看單詞的拼寫。
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