Franklin______learningastronomyatanearlyageAsetab

Franklin ______ learning astronomy at an early age.

A. set about

B. set out

C. set off

D. set up

正确答案：A
18．答案为A富兰克林在年轻的时候就着手学习天文setabout“开始着手”接名词或动名词；setout“出发”；setoff“动身爆炸”；setup“建立”