单项选择题

He ______ reading silently at first.

A．used not to
B．didn't use to
C．was not used to
D．is not used
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单项选择题
I suppose you're not serious, ______
A．don't I
B．do I
C．arc you
D．are not you
单项选择题
Let's ask him for help, ______
A．don't we
B．shall we
C．have we
D．haven't we
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