You look so tired. You _____ all night.<br>Amust have been working<br>Bmight be working<br>Cmust work<br>Dshould have worked

You look so tired. You _____ all night.
Amust have been working
Bmight be working
Cmust work
Dshould have worked

出自：江苏开放大学大学英语（A）1

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