By the time Mrs.Jackson arrived in Shanghai,Mrs.Jackson _______ many famous cities in China.A.visited B.was visiting C.had visited D.has visited

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By the time Mrs.Jackson arrived in Shanghai,Mrs.Jackson _______ many famous cities in China.A.visited B.was visiting C.had visited D.has visited
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By the time Mrs.Jackson arrived in Shanghai,Mrs.Jackson _______ many famous cities in China.A.visited B.was visiting C.had visited D.has visited
By the time Mrs.Jackson arrived in Shanghai,Mrs.Jackson _______ many famous cities in China.
A.visited B.was visiting C.had visited D.has visited

By the time Mrs.Jackson arrived in Shanghai,Mrs.Jackson _______ many famous cities in China.A.visited B.was visiting C.had visited D.has visited
C by +过去的时间,主句谓语动词用过去完成时态.

C