Themissingboyswerelastseen________neartheriver.
A、playingA
所填的词为主语补足语，因其后有明确的地点，补足语表示动作当时正在进行中，所以只能使用 playing 。
In1985,_______becamethefirstinternationalhotelcompanytoopenahotelinChinabearingitsownname.
Thevisitingministerexpressedhissatisfactionwiththetalks,________thathehadenjoyedhisstayhere.
In1995,anaverageof_______ofdomestictravelerswentonsightseeinginChina.
Thegovernmentcalledoutpolicementosuppresstheriot.
WhichofthefollowingisnotmentionedasWTO'sobjective?
