题目内容
They discovered the cause of the fire accidentally. They discovered it _______.
| A.fortunately | B.by chance | C.all of a sudden | D.on purpose |
B
考查短语辨析。Fortunately 幸运地,by chance 偶然地,all of a sudden 突然地,on purpose 故意地,句意:他们无意发现了大火的起因。他们偶然发现的。所以选B。
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