单项选择题

The inventor（）his original design in order to increase the machine’s efficiency.

A. executed
B. modified
C. cultivated
D. decorated

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单项选择题
There are not enough facts to （） a genuine debate of animal awareness.

A. attain
B. retain
C. sustain
D. obtain
单项选择题
Shortly after his retirement, the former president（）gardening and hunting.

A. took to
B. took on
C. took in
D. took after
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