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
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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
单项选择题
______ some mammals came to live in the sea is not known.
A．Which only
B．Since
C．Although
D．How
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