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______a good insulator(绝缘体), rubber is often used in cables.A、Having beenB、To b
______a good insulator(绝缘体), rubber is often used in cables.A、Having beenB、To b
游客
2025-03-04
24
管理
问题
______a good insulator(绝缘体), rubber is often used in cables.
选项
A、Having been
B、To be
C、Be
D、Being
答案
D
解析
本题考查动词的非谓语形式用法。现在分词短语可表示原因、状态等,而不定式一般表示将来或目的。
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