20．If people eat natural poisons by mistake，they ________ go to hospital without delay．（　�。�
A．wouldB．canC．mayD．must

分析 如果人們誤吃了天然的毒素，他們必須立刻去醫(yī)院．

解答 答案是D．本題考查情態(tài)動詞must的用法；情態(tài)動詞must表示"必須；肯定；偏要"，本題中表示"必須去醫(yī)院"，所以答案選擇D．would表示"過去常常；會"；can表示"可能；能力；許可等"；may表示"可以；也許；祝愿等"，可見A、B和C均不符合題意．

點評 要在正確理解情態(tài)動詞的基本含義的基礎上，整體理解語境中的情感態(tài)度，做出合理的判斷．

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