Question

--I hear Jack Chan will come to Laiwu next week.
--Really? _______ he comes, my younger sister will be very happy,

A．If

B．Until

C．Unless

D．Before

Answer 1

A

考查时间状语从句的引导词。“我听说成龙下周会来莱芜。”“真的吗？如果他来了，我妹妹将会非常高兴。”A“如果”；B“直到”；C“除非”；D“在......之前”。故选A。