It’s just pipes, water and pumps, but we haven’t heard of anyone else ________ this technology in this way before.
A. to use B. using C. use D. used
It’s just pipes, water and pumps, but we haven’t heard of anyone else ________ this technology in this way before.
A. to use B. using C. use D. used
B
1. anyone else using this technology in this way为动名词的复合结构，做haven’t heard of 的宾语。