单选题 Mr. Arman admitted that he had been______ surprised by the high volume of sales his company had generated last quarter.
【正确答案】 B
【答案解析】解析：空格出现在be动词和过去分词之间时，把副词当做正确答案的首位候补来分析句意。选项中只有意为“非常地，完全地”的throughly为副词，而且将其放在空格处也符合句意。