17．Only when you have obtained enough data _____come to a sound conclusion．（　�。�
A．can youB．you canC．would youD．you would

分析 只有當(dāng)你獲得了足夠的數(shù)據(jù)，你才能得出一個合理的結(jié)論．

解答 答案A．
"only+狀語/狀語從句"位于句首時，主句用部分倒裝．那么可排除沒有使用倒裝結(jié)構(gòu)的B和D；would表示"將"，can表示"能，能夠"；句子表達的意思是"你才能得出一個合理的結(jié)論"，可排除C；故答案選A．

點評 本題考查倒裝句．倒裝分為部分倒裝和全部倒裝，考試多為部分倒裝．考生應(yīng)掌握什么情況下需要倒裝，并對倒裝后的句子能夠辨認出來．讓學(xué)生了解倒裝的基本概念和構(gòu)成形式，對倒裝句的辨認及正確運用．要對其它各種特殊的句式準(zhǔn)確把握．

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