I began to feel in the new school when I saw some families faces. A. at homeB. at heartC

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(答案→)A. at home
B. at heart
C. at will
D. at sight
解析：此题考查固定短语。feel at home意为感觉自在，符合题意“当我看见一些熟悉面孔时，我在新学校开始感觉自在”。at heart意为：在内心里，at will意为:随意，任意，at sight:一见。