因为干旱,政府对国际援助发出紧急求救.C.A是命令,语意太重,B是建议,语意太轻,不显紧急,C是请求,表达了恳切的意思,D是需求.request[(+for)][+to-v][+that]Mr.Paine made a request that I should help him.佩恩先生要...