Question

— 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

Answer 1

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。