with fright, a hungry fox hid himself in a small cave, his tail to the rain. A. Trembling;

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(答案→)A. Trembling; exposing
B. Trembled; exposed
C. Trembled; exposing
D. Trembling; exposed
解析：考查非谓语动词。tremble“颤抖”，与逻辑主语a hungry fox是主谓关系，应该用主动形式，排除B、C；expose“暴露”，与逻辑主语a hungry fox也是主谓关系。故选A。