– Mary was crying sadly. -- Oh, she ________ the bad news that her mother was
题型：不详难度：来源：
– Mary was crying sadly.
-- Oh, she ________ the bad news that her mother was badly injured in the accident.| A．must know | B．might have known | C．must have known | D．should have known |
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答案
| C |
解析
| 考查虚拟语气.句意:玛丽哭得很伤心._哦,她一定是知道了她的母亲在车祸中严重受伤的坏消息了. “must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。结合语境可知选C. |
举一反三
Driving on the highway ______ be very dangerous, so you ______ be too careful.| A．should; ought to | B．could; should | C．might; mustn’t | D．can; can’t |
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No such authorization ______ be given without the president’s written permission.| A．should | B．shall | C．would | D．may |
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--Who is late for class again?
--________ you ask? Tim, of course．| A．Can | B．Would | C．Could | D．Need |
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