When the man came in, gun in hand, we all stood there, A. astonishedB. astonishingC. bein

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(答案→)A. astonished
B. astonishing
C. being astonished
D. having astonished
解析：考查形容词作伴随状语，句意：当那个人进来的时候，受理拿着枪，我们站在那，震惊了。Astonished 做伴随状语，所以选A。