题目内容

Generally speaking, _________ main material for building houses has been concrete, but _________ wood and stone have also been used.?
A．the; /　　B．/; /?C．the; the 　D．/; the
A
略
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A．the ; a B．the ; the C．a ; a D．a ; the
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A．/; aB．the; aC．/; theD．/; /
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A．/; theB．the; /C．the; aD．/; /
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