Mr Smith often flies to tokyo for meetings 改同义句Mr Smith ofte

正确答案应该是：
Mr Smith often flies to Tokyo for meetings.
改同义句 = Mr Smith often（takes flights/planes) to Tokyo for meetings.
翻译：史密斯先生经常坐飞机去东京参加会议.
flight/plane是可数名词,如果其前面没有任何修饰词,则其在句中只能使用复数形式.