— I hear the famous singer Xu Song may come to Ningbo next month.— Really? he comes, my y

— I hear the famous singer Xu Song may come to Ningbo next month.
— Really? he comes, my younger sister will be very excited.
A. If
B. Until
C. Unless
D. Before

(答案→)A. IfB. UntilC. UnlessD. Before解析： 四个选项分别表示如果,直到、除非和在……之前，根据题意选A,如果他来，我妹妹会非常兴奋。

这下我知道了