单项选择题

I don't think you've heard of him before, ______

A．have you
B．haven't you
C．do I
D．don't I
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单项选择题
Although it is raining hard, ______.
A．I am still going out
B．and I am still going out
C．that I am still going out
D．but I am still going out
单项选择题
It must have rained last night, ______ the ground is wet this morning.
A．because
B．but
C．for
D．or
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