单项选择题

I can't ______what has happened to the vegetables, for they were freshly picked this morning.

A．figure out
B．draw out
C．look out
D．work out
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单项选择题
Professor Johnson is said some significance ______advance in his research in the past year.
A．having made
B．making
C．to have made
D．to make
单项选择题
The remarkable______ of life on the Galapagos Islands inspired Charles Darwin to establish his theory of evolution.
A．classification
B．variety
C．density
D．diversion
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