– Have they found out the _____ of the fire?
--  Yes. It was a cigarette end that _____ the fire.
A．cause; startedB．reason; caused
C．causing; causedD．reason; cause
A
第一空考查cause和reason的區(qū)別，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：--你發(fā)現(xiàn)大火的起因嗎？--是，是香煙頭引起的大火。選A。
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