Yesterday if the policeman _______earlier, the fight between the two boys would have been prevented.
A．would have arrived B．had arrived
C．were to arrive D．a(chǎn)rrived
B
考查虛擬語(yǔ)氣。根據(jù)語(yǔ)境為對(duì)過(guò)去事實(shí)相反的虛擬語(yǔ)氣，故從句用had + v-ed，故選B。句意：昨天如果警察早點(diǎn)到，兩個(gè)男孩之間的打斗就會(huì)被阻止。
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