单项选择题

______hearing the news, all of us jumped with joy.

A．At
B．On
C．By
D．In
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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
单项选择题
It was not______I saw Helen the next morning______I felt relieved.
A．until; that
B．when; that
C．until; when
D．when; then
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