单项选择题

______ three times in a row, the boxer decided to give up fighting.

A．Because having been defeated
B．Because being defeated
C．Having been defeated
D．Having defeated
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单项选择题
Not until Kentucky's Mammoth Cave had been completely explored in 1972______.
A．when was its full extent realized
B．that its full extent realized
C．was its full extent realized
D．the realimtion of its full extent
单项选择题
The Chisos Mountains in Big Bend National Park in Texas were created by volcanic eruptions that occurred ______.
A．the area in which dinosaurs roamed
B．when dinosaurs roamed the area
C．did dinosaurs roam the area
D．dinosaurs roaming the area
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