The light is out. Mr. Neat to bed already.A. may goB. must goC. must be goingD. must have

问题补充：

The light is out. Mr. Neat to bed already.

A. may go

B. must go

C. must be going

D. must have gone

答案：

A. may go

B. must go

C. must be going

(答案→)D. must have gone

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