问题
选择题
______ a good insulator , rubber is often used in cables.
A．Having been
B．To be
C．Be
D．Being
答案
答案：D
现在分词短语表原因。
搜题请搜索小程序“爱下问搜题”
______ a good insulator , rubber is often used in cables.
A．Having been
B．To be
C．Be
D．Being
答案：D
现在分词短语表原因。