单项选择题

Do you want to fly first or______ class

A．savings
B．thrifty
C．economy
D．economics
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单项选择题
The whole family has______ a period of considerable hardship and unhappiness.
A．undertaken
B．underlined
C．undone
D．undergone
单项选择题
Students______ business administration must take at least one course in statistics.
A．participating in
B．joining in
C．choosing to
D．majoring in
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