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; /
A

試題分析：句意：隨著航空領(lǐng)域的一大突破天宮一號(hào)的成功發(fā)射，中國(guó)的太空夢(mèng)朝現(xiàn)實(shí)更邁進(jìn)了一步。第一空填a，泛指這是一個(gè)突破，第二空不填，reality是抽象名詞，選A。
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