单项选择题

I do not remember ________________ this book before.

A．reading
B．having ever read
C．to have ever read
D．to read
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单项选择题
It takes about 365N days for the Earth to ____________ around the Sun in its orbit.
A．rotate
B．roll
C．spin
D．revolve
单项选择题
The old couple tried to accuse their children of neglecting their ___________ duties.
A．docile
B．tame
C．obedient
D．filial
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