7．As we all know，it is usually cold in this place in January，but it _____ be warm sometimes．（　�。�
A．mustB．canC．shouldD．would

分析 眾所周知，這個地方一月份通常冷，但是有時也會暖和．

解答 答案是B．本題考查表示推測的情態(tài)動詞的用法．情態(tài)動詞must表示推測只能出現(xiàn)在肯定句中，表示有客觀依據(jù)的推測"準是，一定是"．can表示推測往往出現(xiàn)在否定句或疑問句中；在肯定句中出現(xiàn)時表示"客觀上、理論上的可能性"，常常暗示可能性很小，與一般情況不相符．should表示推測時往往表示"按照常理常規(guī)的推測"，表示"按照道理應該…"；would表示推測時表示有充分理由的推測；本題中由上文的"usually cold"，判斷"be warm"與一般情況不符，只是客觀上的可能性，所以答案是B．

點評 要在正確理解情態(tài)動詞的基本含義的基礎(chǔ)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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