How many cities has the Smiths traveled to since they came to China last week?A.have,traveled B.was,traveledC.did,travel to D.has,traveled to

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HowmanycitieshastheSmithstraveledtosincetheycametoChinalastweek?A.have,traveledB.was,traveledC.did,t

How many cities has the Smiths traveled to since they came to China last week?A.have,traveled B.was,traveledC.did,travel to D.has,traveled to
How many cities has the Smiths traveled to since they came to China last week?
A.have,traveled B.was,traveled
C.did,travel to D.has,traveled to

How many cities has the Smiths traveled to since they came to China last week?A.have,traveled B.was,traveledC.did,travel to D.has,traveled to
有since存在,所以是"完成时" has/have travelled
the Smiths 指的是Smith一家,作为一个整体,所以是has travelled
自从上周他们去中国之前,Smith一家已经去过多少个国家?