单项选择题

______ both sides accept the agreement will a lasting peace be established in this region.

A．Unless
B．As long as
C．If only
D．Only if
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单项选择题
The wild flowers looked like a soft orange blanket ______ the desert.
A．covering
B．covered
C．cover
D．to cover
单项选择题
I was giving a talk to a large group of people, the same talk I ______ to half a dozen other groups.
A．was giving
B．am giving
C．had given
D．have given
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