单项选择题
In a second-hand bookshop, Billy came across a book which he thought was certainly a ______edition.
A．rare
B．scarce
C．seldom
D．hardly
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单项选择题
Talking to foreigners is fun if you ______ the right time and place.
A．locate
B．consider
C．choose
D．decide
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单项选择题
They ______ shopping, when someone knocked at the door.
A．are about to
B．are to go
C．were about to go
D．were to go
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