游客
题文

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;/
科目 英语   题型 单选题   难度 中等
知识点: 冠词的用法辨析
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