问题
选择题
The scientist has been greatly successful in the experiment that he _____ to do three years ago. [ ]
A. set off
B. set down
C. set out
D. set about
答案
答案：C
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The scientist has been greatly successful in the experiment that he _____ to do three years ago. [ ]
A. set off
B. set down
C. set out
D. set about
答案：C