单项选择题

______ that the earth was flat

A．Used it to be thought
B．Did it used to be thought
C．Was it used to being thought
D．Does it used to be thought
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单项选择题
Rock climbing is so popular now that many people are able to ______ the steepest face with great agility.
A．scale
B．surpass
C．overcome
D．mount
单项选择题
The battle is of great significance when viewed in the ______ of the progress of the war.
A．prospective
B．respective
C．perspective
D．prescriptive
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