问题
选择题
Coughing _____ also be used for social reasons, such as the coughing before giving a speech．
A．may
B．should
C．must
D．need
答案
答案：A
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Coughing _____ also be used for social reasons, such as the coughing before giving a speech．
A．may
B．should
C．must
D．need
答案：A