单项选择题
A．Helping
B．Help
C．Helped
D．To help
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单项选择题
A．prepareB．preparedC．to prepareD．preparing
A．prepare
B．prepared
C．to prepare
D．preparing
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单项选择题
A．timeB．sequenceC．presentationD．course
A．time
B．sequence
C．presentation
D．course
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