问题
选择题
| 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 |
答案
答案：A
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| 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 |
答案：A