How many cities has the Smiths traveled to since they came t

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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

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?

How many cities has the Smiths traveled to since they came t the p____ have taken many pictures since they came here The foreigners _____ many places since they came here. They traveled on and on across the ocean until they came to The work has been finished since they came here The Blacks___many places of interest since they came to chin The twin sister______(learn)Chinese since they came to China .The light from other planets has traveled for many years to my father has traveled to many ______ places in the world. Could you tell me how many English words __ since you came t 1.Jim has made many friends since he [came] to china How long have___lived here?Since they came to China three ye