In science fiction we read of flying saucers travel through _____ space, so people want to have ______ better knowledge of the universe.A.the; aB./; /C.the; /D./; a
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D解析space作“太空；空间”讲时，是不可数名词，前不需冠词。have a knowledge of 意为“对……理解/ 熟悉”。如：He has a good knowledge of politics.（他对政治非常熟悉）。故D是正确