问题
选择题
— I hear the famous singer Xu Song may come to Weifang next month.
— Really? _______ he comes, my younger sister will be very excited.
A．If
B．Until
C．Unless
D．Before
答案
答案：A
在if 引导的时间状语中，if 引导的条件状语中，主句为一般现在时，从句用一般现在时，代替将来时，故选A