They discovered the cause of the fire accidentally. They discovered it _______.
A．fortunatelyB．by chanceC．a(chǎn)ll of a suddenD．on purpose
B
考查短語辨析。Fortunately 幸運地，by chance 偶然地，all of a sudden 突然地，on purpose 故意地，句意：他們無意發(fā)現(xiàn)了大火的起因。他們偶然發(fā)現(xiàn)的。所以選B。
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