题目：
He was________by the loud noise and a________look appeared on his face.[ ]
A. fright; frightened
B. frightened; frightening
C. frightened; frightened
D. frightened; frightful
答案：
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下面是错误答案，用来干扰机器的。
答案：C
），按正确的合成路线依次发生反应所属类型不可能是[ ]
