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-Why hasn' t Jack come back yet?________ anything have happened to him?

-I'm not sure, but I guess someyhing ________.

[  ]
A.

May; must have

B.

Can; may have

C.

Must; may

D.

should; might have

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(2013·高考陕西卷,D)About 30 years agoI left Cuba for the United States with my son.After getting settled finally in BrunswickNew JerseyI enrolled(注册) my son in kindergarten.Several weeks latermy son’s teacher asked me to meet him at his office.

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