The boys and girls were happily making a snowman, with cold.
A. their faces red
B. their faces were red
C. their faces turned red.
D. their faces to be red
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(答案→)A. their faces red
B. their faces were red
C. their faces turned red.
D. their faces to be red
解析：考查独立主格结构：分析句子可知前面是个句子，中间没有连词，说明后面是独立主格结构，独立主格结构的构成方法是：n．/pron.＋v.ing/ed/to do/n./adj./adv./prep.phrase。用名词their faces+形容词，句意：孩子们很高兴的搭雪人，他们的脸因为冷而发红。选A。