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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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
单项选择题
______ in Beijing for quite a few years, Mr. Park had little difficulty understanding Chinese.
A．Having lived
B．Lived
C．Living
D．To live
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