单项选择题

The glass vessels should be handled most carefully since they are______

A．crisp
B．intricate
C．subtle
D．fragile
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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
单项选择题
He blew out the candle and ______ his way to the door.
A．converged
B．wrenched
C．groped
D．strove
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