单项选择题

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

A．During the 1960's
B．It was in the 1960's
C．That it was in the 1960's
D．It was the 1960's
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单项选择题
Someone is at the door . ________
A．What is it
B．Who is it
C．Who is he
D．Which one is it
单项选择题
I tried very hard to persuade him to join our group but I met with a________ refusal.
A．flat
B．dull
C．blank
D．frank
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