Sometimes smiles around the world be false, hiding other feelings like anger, fear or worry.
A. must
B. can
C. should
D. would
网友回答
A. must
(答案→)B. can
C. should
D. would
解析:考察情态动词。Must必须 can可能 should 应当 would 愿意,将要
句意为,有时候,全世界的微笑都可能是假的,把他们的感受,比如气愤,恐惧或者担心隐藏起来。