With the successful launch of Tiangong-l, 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-l, 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;/ |