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People always shake hands and say“How do you do? when to each other. [ ] A.intro

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People always shake hands and say“How do you do? when to each other. [ ] A.intro

People always shake hands and say“How do you do?”when ________ to each other.

[]

A.introducedB.introducingC.introduceD.to be introducing

试题答案

答案:A

解析:

when+introduced在此处相当于when they are introduced…