单项选择题

There has been a great increase in retail sales,______

A．does there
B．isn't there
C．hasn't there
D．isn't it
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单项选择题
He blew out the candle and ______ his way to the door.
A．converged
B．wrenched
C．groped
D．strove
单项选择题
The person who______ this type of approach for doing research deserves our praise.
A．generated
B．originated
C．speculated
D．manufactured
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