单项选择题

What do you mean______saying that you've never heard of it before

A．in
B．by
C．as
D．with
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单项选择题
______hearing the news, all of us jumped with joy.
A．At
B．On
C．By
D．In
单项选择题
The boss is much kinder to Helen than to the other colleagues, ______of course, makes them unhappy.
A．he
B．who
C．which
D．that
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