单项选择题

" Here is the money I promised," he said," I always ______ my promise."

A．agree
B．follow
C．make
D．keep

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单项选择题

______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth

单项选择题

A．selectionsB．separationsC．seriesD．sections

A．selections
B．separations
C．series
D．sections

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