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
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单项选择题
The United Nations ______ formed in 1945.
A．is
B．was
C．are
D．were
单项选择题
The first thing ______ I would do when I get America is to write to you.
A．which
B．that
C．as
D．what
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