问题
选择题
— 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
答案：A
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。
