问题
选择题
– Have they found out the _____ of the fire?
-- Yes. It was a cigarette end that _____ the fire.
A．cause; started
B．reason; caused
C．causing; caused
D．reason; cause
答案
答案：A
第一空考查cause和reason的区别，cause是起因，和of搭配，reason是理由和for搭配，第二空考查start的起火，句意是：--你发现大火的起因吗？--是，是香烟头引起的大火。选A。