第4题: [填空题]My son has been to the Europe. By the time he is twenty,________________(他到那时几乎已走遍各处). 参考答案:By the time he is twenty,{{U}}he will have been almost everywhere.{{/U}} 答案解析:[答案详解] 本题主要考查英语中时态的恰当用法。已给出的“By the time he is twenty”中, by the time引导的是一般现在时从句,因此主句用将来完成时。故译为“he wi