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, China's space dream took a step closer to ______ reality.
A.a; / | B.the; a | C.a; the | D.the; / |