单项选择题

______ that saw the trade between the two countries reach its highest point.

A．During the 1990"s
B．That it was in the 1990"s
C．It was in the 1990"s
D．It was the 1990"s
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单项选择题
With nothing ______ to burn, the fire became weak and finally died out.
A．leaving
B．left
C．leave
D．to leave
单项选择题
Without the sun s light ______ the earth s surface, no life could exist on the earth.
A．warms
B．warmed
C．to warm
D．warming
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