填空题

A saying congratulations
B making an enquiry
C expressing gratitude
D making complaint
E asking for information
F giving a notice
G giving criticism
H offering an invitation ___________________

【参考答案】

G
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填空题
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单项选择题
According to the writer, the problem of scheduling services（）

A．involves services performed on a product and on a customer.
B．lies in the sequence of being served.
C．concerns the maximization of production capacities.
D．derives from the complex scheduling process.
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