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19、China opened its door to the outside world in 1978.______that had far-reaching effects.

A.Did a new development come then    B.Came then a new development

C.Then came a new development        D.Then did a new development come

19、C

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China opened its door to the outside world in 1978.______that had far-reaching effects.

A.Did a new development come then    B.Came then a new development

C.Then came a new development        D.Then did a new development come

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