单项选择题

The age of other trees is variously estimated as () from two hundred to eight hundred years.

A.changing
B. differing
C. varying
D. ranging

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单项选择题
Having been an office secretary for some years, she always () chores in a responsible way.

A. goes on
B. goes for
C. goes without
D. goes about
单项选择题
41()

A. stay away
B. stand out
C. step down
D. set off
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