问题补充:
a good insulator(绝缘体) , rubber is often used in cables.
A. Having been
B. To be
C. Be
D. Being
答案:
A. Having been
B. To be
C. Be
(答案→)D. Being
解析:现在分词短语表原因,状态等;不定时表示将来,目的。
时间:2020-08-12 04:25:45
a good insulator(绝缘体) , rubber is often used in cables.
A. Having been
B. To be
C. Be
D. Being
A. Having been
B. To be
C. Be
(答案→)D. Being
解析:现在分词短语表原因,状态等;不定时表示将来,目的。