单项选择题

A．ensure
B．protect
C．undertake
D．promise
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A．register nameB．advertisementC．business philosophyD．organization form
A．register name
B．advertisement
C．business philosophy
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单项选择题
A．helpingB．to helpC．helping toD．to help to
A．helping
B．to help
C．helping to
D．to help to
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