单项选择题


A．are
B．were
C．have been
D．had been
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单项选择题
A．sitB．satC．seatingD．seated
A．sit
B．sat
C．seating
D．seated
单项选择题
A．worryingB．willingC．afraidD．scaring
A．worrying
B．willing
C．afraid
D．scaring
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