Mountain climbing _______ be tiring and many people feel sick as the atmosphere gets thinner.
A．needB．canC．mustD．would
B

試題分析：這里表示“推測”意思是可能，故用can。
點(diǎn)評(píng)：情態(tài)動(dòng)詞本身不能單獨(dú)作謂語，只能和其它動(dòng)詞構(gòu)成謂語，表達(dá)特殊的功能和意義。在學(xué)習(xí)情態(tài)動(dòng)詞時(shí)主要從其語法功能和特殊含義的歸納上下功夫，如情態(tài)動(dòng)詞表示能力、情感態(tài)度和表示推測三種意義的用法差別等。
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