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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
考查虛擬語氣。根據(jù)語境為對過去事實相反的虛擬語氣，故從句用had + v-ed，故選B。句意：昨天如果警察早點到，兩個男孩之間的打斗就會被阻止。
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