题目内容
It was only when they returned to Italy from China____________ Marco Polo, who was then 15 years old, first met his father.
A. which B. when C. that D. what
C
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题目内容
It was only when they returned to Italy from China____________ Marco Polo, who was then 15 years old, first met his father.
A. which B. when C. that D. what
C