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- 1970-1-1
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response to higher oil prices, window manufacturers have improved the insulating capability of their products; their windows have been built to conserve energy, and they are.
A have been built to conserve energy, and they are
B are built to conserve energy, and they have
C are built to conserve energy, and they do
D are being built to conserve energy, and they have
E had been built to conserve energy, and they are
答案C。
楼主看下这个句子的they指代什么?我觉得已经有their指代manufacturer了,they应该和their指代一个东西啊,但我觉得是windows. |
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