单项选择题

"What are you busy ______" "I am busy ______ the plan for the sports meeting."

A．in; to make
B．about; to make
C．in; making
D．about; making
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单项选择题
The event took place during ______.
A．First World War
B．the First World War
C．World War the One
D．the World War One
单项选择题
The number of the students who can attend this course ______ fifteen.
A．have
B．has
C．are
D．is
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