单项选择题

The whole family has______ a period of considerable hardship and unhappiness.

A．undertaken
B．underlined
C．undone
D．undergone
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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
单项选择题
George knew that it was difficult for him to clear the height, but he succeeded upon his third______
A．attempt
B．temptation
C．display
D．action
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