With the successful launch of Tiangong-I, which was ______ breakthrough in space field,

With the successful launch of Tiangong-I, which was ______ breakthrough in space field, China's space dream took a step closer to ______ reality.

A a; / B. the; a C. a; the D the; /

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With the successful launch of Tiangong-I, which was ______ breakthrough in space field,

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