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Sometimes smiles around the world ______ be false, hiding other feelings like anger, fear or worry.
A.mustB.wouldC.shouldD.can
D

试题分析:考查情态动词:本句意思为:世间有些笑容可能是虚假的,掩盖了其他的感情,像生气、恐惧和担心。这里用can表示有客观的可能性,A. must必须,B. would会,C. should应该,选D。
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