单项选择题

Do you often look out of the windows while you ______ lessons

A．have
B．had
C．are having
D．has
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单项选择题
______ around our city, the foreigners were invited to have attend an evening party.
A．Have shown
B．Having been shown
C．Been shown
D．Being showing
单项选择题
Dolly might have been ______ responsible far the traffic accident.
A．partly
B．part
C．apart
D．partial
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