The result was not as good as expected but the on his face told us that he was still very

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(答案→)A. expression
B. impression
C. celebration
D. appearance
解析：考查名词：A．expression表达，表情，B．impression印象，C．celebration庆祝， D．appearance外貌，外表，句意：结果没有预料的好但是他脸上的表情告诉我们他还是很高兴。选A。