题目内容

Mr. Brown has checked out but he found that he ________ something in the room.

A. must left
B. must have left
C. must leave
D. must be leaving

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Could you fill out this _______, please?

A. request slip
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could you tell me the _____ to be researched?

A. regions
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A. charger
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We'll _______it immediately.

A. see
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