2. 考研
  3. Making energy use completely harmless to the environment______ very difficult and usually economically expensive.

Making energy use completely harmless to the environment______ very difficult and usually economically expensive.

admin2014-11-28  47
问题 Making energy use completely harmless to the environment______ very difficult and usually economically expensive.
选项 A、is
B、are
C、have been
D、shall be
答案A
解析
转载请注明原文地址:https://kaotiyun.com/show/1aii777K
本试题收录于： GCT工程硕士（英语）题库专业硕士分类
0

GCT工程硕士（英语）

专业硕士

相关试题推荐
随机试题
最新回复(0)