问题
选择题
Smiles around the world _____ be false, ______ other feelings like anger, fear or worry.[ ]
A. must; hide
B. must; hiding
C. can; hide
D. can; hiding
答案
答案：D
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Smiles around the world _____ be false, ______ other feelings like anger, fear or worry.[ ]
A. must; hide
B. must; hiding
C. can; hide
D. can; hiding
答案：D