问题
选择题
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
答案
答案：B
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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
答案：B