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As we all know, _______ mankind has realized the walk in ______ space.
A．the; theB．/; theC．/; /D．the; /
C
本題考查冠詞。mankind做“人類”講時，是集合名詞，可用單數或復數，用單數時不加a；space為不可數名詞,作其義時,前不加冠詞。選C。
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