On receiving the assignment,we _at once.A.set to work B.set out to work C.get down to work

题目

On receiving the assignment,we _at once.A.set to work B.set out to work C.get down to work
D.all the above
选什么,如何翻译

答案

选D
set to do
set out to do
get down to do
都有开始,着手做某事的意思
译为：一接到通知,我们立刻开始干了起来
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