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Engineers had a better choice of material, ______________ (当新发明被投入使用以后).
Engineers had a better choice of material, ______________ (当新发明被投入使用以后).
admin
2010-10-28
70
问题
Engineers had a better choice of material, ______________ (当新发明被投入使用以后).
选项
答案
after the new invention was put into use/practice/operation
解析
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大学英语六级
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