问题
选择题
Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry. [ ]
A. must
B. can
C. should
D. would
答案
答案：B
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Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry. [ ]
A. must
B. can
C. should
D. would
答案：B