I learned a lot ___ in the countryside.A.working B.while working C.when worked D.to work请问为什么

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I learned a lot ___ in the countryside.A.working B.while working C.when worked D.to work请问为什么

I learned a lot ___ in the countryside.A.working B.while working C.when worked D.to work请问为什么
I learned a lot ___ in the countryside.
A.working B.while working C.when worked D.to work
请问为什么

I learned a lot ___ in the countryside.A.working B.while working C.when worked D.to work请问为什么
省略,当主句从句的主语相同的时候,
从句中,可以省略主语和助动词
完整的:i learned a lot while I was working in the countryside.
省略,就是 ...while working ...