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(chǎn);/B．the； aC．a(chǎn); theD．the;/
A

試題分析：考查冠詞。可數(shù)名詞單數(shù)前加a/an；表泛指，意為“一個(gè)”；the是特指，意為“那個(gè)，這個(gè)”；不可數(shù)名詞前不用冠詞。breakthrough突破，這里是指“天宮一號(hào)”的成功發(fā)射，是具體的一件事，前用不定冠詞a；排除B、D；reality現(xiàn)實(shí)，不可數(shù)，排除C。故選A。
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