6．We need to master this technology immediately，______ we will fall behind．（　�。�
A．butB．orC．soD．and

分析 我們需要立即掌握這個(gè)技術(shù)，否則我們會(huì)落后．

解答 答案：B
根據(jù)句意，"We need to master this technology immediately""我們必須掌握技術(shù)"可知，"or"意為"否則的話(huà)"符合題意．"but"表示轉(zhuǎn)折，so意為因此，and并列連詞．

點(diǎn)評(píng) 考查連詞，考生需聯(lián)系上下文做出判斷．

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