这道题考得是虚拟语气
he'd have known缩写的是would
主句是would have done从句是与过去事实相反的,所以用had done
if Mr.Robinsion had looked就对了
再加上倒装的用法选A,那个人与look是主动关系（主谓关系）,所以不是D
___at the price list ,he'd have known what to expet.
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