12．It is easy to set the goal of our production for next year，but      to achieve it takes a lot of trouble．（　�。�
A．howB．whoC．whereD．when

分析 為我們明年的產(chǎn)品確立一個目標很容易，但如何實現(xiàn)目標卻不輕松．

解答 答案：A 句中to achieve it是作句子的主語；how表示方式，who指代人，where表示地點，when表示時間；句意表達的是和set the goal確立目標，相對應(yīng)的實現(xiàn)目標，應(yīng)該是實現(xiàn)目標的方法．故選A．

點評 從屬連詞是連詞的一種，用來引導(dǎo)名詞性從句和狀語從句．大致可分為三大類：that（無詞義，不做成分）if，whether （表達是否的意義，但不做句子成分）； 連接代詞：who，whom，whose，what，which，whatever，whoever，whichever（有詞義，在句子中可作主語、表語、賓語）；連接副詞：when，where，why，how，how many，how long，how far，however，whenever，wherever （有詞義，作從句的狀語）．學習時，要注意區(qū)分和掌握．

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