- .a fire-engine is running over towards us. -Yes.a big fire nearby.I guess. A.T
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— ，a fire-engine is running over towards us.
—Yes，a big fire nearby，I guess.
A.Take care；must break out B.Be careful；must break out
C.Look out；must have broken out D.Look；was broken out
试题答案
C
火灾发生是过去的事，故用must have done结构，break out无被动语态。