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

試題分析：考查情態(tài)動詞：本句意思為：世間有些笑容可能是虛假的，掩蓋了其他的感情，像生氣、恐懼和擔(dān)心。這里用can表示有客觀的可能性，A. must必須，B. would會，C. should應(yīng)該，選D。
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