题目内容

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

试题分析：这里表示“推测”意思是可能，故用can。
点评：情态动词本身不能单独作谓语，只能和其它动词构成谓语，表达特殊的功能和意义。在学习情态动词时主要从其语法功能和特殊含义的归纳上下功夫，如情态动词表示能力、情感态度和表示推测三种意义的用法差别等。
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