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.
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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.
单项选择题
A．They are planning a picnic for the department.B．They are having a picnic organized by the department.C．They are discussing how to escape from the sun.D．They are drinking and talking about the weather.
A．They are planning a picnic for the department.
B．They are having a picnic organized by the department.
C．They are discussing how to escape from the sun.
D．They are drinking and talking about the weather.
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