单项选择题

Let's be incredibly gracious and suppose that you know 1% of everything ________ to know.

A. it is
B. as is
C. there is
D. what is
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单项选择题
Many women still feel that they are being ________ by a male culture, particularly in the professional services sector.
A. held back
B. held forth
C. held on
D. held out
单项选择题
Every chemical change either results from energy being used to produce the change, or causes the energy to ________ in some form.
A. give off
B. put out
C. set off
D. use up
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