单项选择题

______ initial recognition while still quite young.

A．Most famous scientists achieved
B．That most famous scientists schieved
C．Most famous scientists who achieved
D．For most famous scientists to achieve

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热门试题

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