Does everyone know what to do if a fire ______?
A．is broken upB．breaks upC．is broken outD．breaks out
D
考查時(shí)態(tài)及語態(tài).當(dāng)主句為一般現(xiàn)在時(shí)態(tài)時(shí),從句用一般現(xiàn)在時(shí)態(tài).句子fire是爆發(fā)的主體,故用主動語態(tài),選D.
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