单项选择题
I have to （）my visit as I’ll be very busy next week.
A.call for B.call on C.call off D.call in
单项选择题 Itisvery（）ofyoutoletusknowyouaregoingtobelate.
单项选择题 Insomecountries，trafficpolicecan（）instantfinesonspeedingmotorists.
单项选择题 Theclothesapersonwearsmayexpresshis（）orsocialposition.
