10．My son must have passed the examination，but he wasn't careful enough in the math exam．

分析 我的兒子本來可以通過考試的，但是考試數(shù)學(xué)時卻粗心大意了．

解答 答案：must-should  根據(jù)句意，應(yīng)該表示本應(yīng)該做某事而未做，應(yīng)使用：should have done sth

點評 考生在做題時需理清文章的邏輯關(guān)系，抓住文章中心思想，連續(xù)上下文內(nèi)容進行推測，同時注意詞性、語態(tài)、時態(tài)的轉(zhuǎn)換，分析句子結(jié)構(gòu)．

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