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
By eleven o'clock the day before yesterday, we（）at the station.

A．had arrived
B．have arrived
C．shall arrive
D．arrive
单项选择题
The United Nations（）formed in 1945.

A．is
B．was
C．are
D．were
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