Question

      you become a professional soccer player, you will have a happy life.
A. If                     B. Unless             C. Until

Answer 1

A

试题分析：A. If如果，B. Unless除非，C. Until直到。if引导的条件状语从句，主句用一般将来时，从句用一般现在时，即主将从现。句意：如果你成为一名职业足球运动员，你将会有快乐的一生。故选A。