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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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
单项选择题
I once worked in the place______I visited last week.
A．where
B．which
C．in which
D．in that
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