Smiles around the world _____ be false, ______ other feelings like anger, fear or worry.
A．must; hideB．must; hidingC．can; hide D．can; hiding
D

這里的can表示有客觀可能性，hiding是現(xiàn)在分詞做狀語，世界上的微笑可能是假的，隱藏了像憤怒這樣的其它情感。
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