单项选择题

______ that the trade between the two countries reached its highest point.

A．During the 1960s
B．It was in the 1960s
C．That it was in the 1960s
D．It was the 1960s
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单项选择题
The local health organization is reported ______ twenty-five years ago when Dr. Audon became its first president.
A．to be set up
B．being set up
C．to have been set up
D．having been set up
单项选择题
More than one third of the Chinese in the United States live in California, ______ in San Francisco.
A．previously
B．predominantly
C．practically
D．permanently
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