单项选择题

All the teachers and students _____, the ceremony was declared open.

A．had arrived
B．arrived
C．having arrived
D．arriving
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单项选择题
_____ any reply, Mary decided to visit the company herself.
A．Having not
B．Not having got
C．Not having
D．Having not got
单项选择题
_____ he completed his education abroad, he has been working for a travel agency in Shanghai.
A．As soon as
B．Since
C．By the time
D．When
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