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
______ all customs, no matter how sacrosanct, are essentially learned reactions appropriate perhaps only to the holders thereof is a basic assumption of anthropologists.
A．Nearly
B．It is nearly
C．That nearly
D．When nearly
单项选择题
An extensive foundation in the basic sciences should be required of all science students, ______.
A．whether they are future physicists or chemists.
B．be they future physicists or chemists.
C．they are future physicists or chemists.
D．they should be future physicists or chemists.
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