单项选择题

What______ doing when you______

A．were they; got there
B．they were; arrived there
C．were they; came there
D．they were; reached there
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单项选择题
______is a fact that English is being accepted as an international language.
A．This
B．There
C．That
D．It
单项选择题
Some of them______ here for three days.
A．have arrived
B．have got
C．have reached
D．have been
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