The look on his face showed that he hadn’t expected it .A. astonishedB. astonishingC. bei

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(答案→)A. astonished
B. astonishing
C. being astonished
D. having astonished
解析：句意：他脸上的表情表示他从没有想到过。这里需要形容词修饰look，修饰和人有关的面容，表情，眼神等，都是用过去分词式的形容词，所以选A。