有since存在,所以是"完成時" has/have travelled
the Smiths 指的是Smith一家,作為一個整體,所以是has travelled
自從上周他們?nèi)ブ袊?Smith一家已經(jīng)去過多少個國家?
How many cities has the Smiths traveled to since they came to China last week?
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
A.have,traveled B.was,traveled
C.did,travel to D.has,traveled to
英語人氣：501 ℃時間：2019-10-19 06:45:58
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