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million of pounds'worth of damage ______ by a storm which sw

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million of pounds'worth of damage ______ by a storm which swept across the north of English last
night. a,has been caused b,had been caused c,will caused d,will have been caused老师说选a为什么不选b?
million of pounds'worth of damage ______ by a storm which sw
句子强调的是“从last night到现在”的结果,所以用“has been caused".
如果用B,强调的是last night以前的事情,不符合句子的语境.
求个好评~