单项选择题

A．Nine out of ten.
B．One third.
C．Eleven out of thirty.
D．One fourth.
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单项选择题
A．Because it was their hometown.B．Because they wanted to help the AIDS patients.C．Because they were doing their summer social topics.D．They were learning medicine and doing research on HIV.
A．Because it was their hometown.
B．Because they wanted to help the AIDS patients.
C．Because they were doing their summer social topics.
D．They were learning medicine and doing research on HIV.
单项选择题
A．Once.B．Twice.C．Three times.D．Four times.
A．Once.
B．Twice.
C．Three times.
D．Four times.
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