The old lady was at the thought of the experience in the forest.A. terrified；terrifyingB.

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(答案→)A. terrified；terrifying
B. terrifying；terrified
C. terrified；terrified
D. terrifying；terrifying
解析：句意：这位年老的女士非常的害怕一想到在森林令人害怕的经历。terrified感到害怕的，修饰人；terrifying令人害怕的，修饰物。所以选A。