---who______it be that is knocking at the door? ---It_______be Father, but I’m n
题型：不详难度：来源：
---who______it be that is knocking at the door?
---It_______be Father, but I’m not sure.| A．can, must | B．can, may | C．must, can | D．may, must |
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答案
| B |
解析
试题分析：句意：--敲门的会是谁？---有可能是父亲，但是我不是很肯定。第一空填can，用于否定或疑问句表示推测“可能”，第二空填may，因为说话人不是很确定，but I’m not sure.所以选B。 |
举一反三
Whether dying patients be helped to end their lives is a tough moral question.| A．must | B．should | C．might | D．would |
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My computer ____start, no matter how hard I try.
-lt might have crashed.| A．won"t | B．shouldn"t | C．mustn"t | D．wouldn"t |
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According to the latest study，most traffic accidents be prevented if drivers are careful enough．| A．must | B．can | C．have to | D．need |
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—Are you coming for dinner?
—I’m not quite sure. I ______ go to my uncle’s instead.| A．must | B．would | C．should | D．might |
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| According to the factory safety rules, all accidents _____ be reported to the safety officer. |
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