单项选择题
A.had had to
B.had to
C.has had to
D.has to
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单项选择题
A.systemB.shockC.deviceD.operation
A.system
B.shock
C.device
D.operation
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单项选择题
A.exceptB.butC.andD.instead
A.except
B.but
C.and
D.instead
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