3．Determined to devote himself to those poor children，he chose to teach in a western province，though he          in the city for a better life．（　　）
A．could have stayedB．would have stayed
C．could stayD．had stayed

分析 決心奉獻(xiàn)于那些貧窮的孩子身上，盡管為了更好的生活他本可以選擇待在城市里，但是最終他選擇在西部省份教學(xué)．

解答 答案A  根據(jù)句意可知，這是對過去的情況的猜測或判斷，應(yīng)該使用"情態(tài)動詞+have done"的結(jié)構(gòu)，本可以做某事，應(yīng)該使用could have done，故答案為A

點(diǎn)評 對于情態(tài)動詞的學(xué)習(xí)應(yīng)該熟悉每個情態(tài)動詞所表達(dá)的意義，特別是一些特殊情況的用法，根據(jù)句意來選擇正確的答案．

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