题目内容
9．The doctors in Shenzhen did all they ______ to save Yao Beina，a famous singer，but she still died．（ ）| A． | would | B． | could | C． | must | D． | might |
分析 深圳的医生们尽他们最大的努力去挽救姚贝娜，一个著名的歌手，但是她还是去世了．
解答 答案：B．A．would 会；B．could能；C．Must必须；D．Might可能．根据did all sb…to do，可知这里是尽某人所能去做某事的意思，所以应用can的过去式could，表示"能够（做的所有努力）"．故选B．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题的关键．
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