单项选择题

A．maintain
B．undergo
C．experience
D．undertake
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单项选择题
A．recallB．recommendC．reckonD．recognize
A．recall
B．recommend
C．reckon
D．recognize
单项选择题
A．ThusB．YetC．HoweverD．Therefore
A．Thus
B．Yet
C．However
D．Therefore
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