单项选择题

The boss still ______ in working ten hours a day in his office after leaving hospital.

A．persists
B．consists
C．insists
D．resists
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单项选择题
Though it was getting dark, ______ still went on working.
A．he
B．but he
C．and he
D．so he
单项选择题
The United Nations ______ formed in 1945.
A．is
B．was
C．are
D．were
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