单项选择题

We had trouble finding a pure water supply

A．typical
B．complete
C．clean
D．clear
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单项选择题
On the table was a vase filled with artificial flowers
A．wild
B．fresh
C．lovely
D．false
单项选择题
He kept in constant contact with his family while he was in Australia
A．gradual
B．regular
C．direst
D．occasional
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