应用文的结构总体要求是结构完整、条理清楚、逻辑严密。
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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
Could you fill out this _______, please?
A. request slip
B. requesting slip
C. requst slips
D. requst slip
could you tell me the _____ to be researched?
A. regions
B. places
C. place
D. region
What's the correct expression of 充电器?
A. charger
B. electric charger
C. electronic charger
D. charging