翻译:Human error may have been a contributing factor
Cigarette smoking is a major factor contributing to cancer.
A major factor contributing to voltage instability is the vo
Senator Henry Jackson says that a major factor contributing
It has been increased by a factor of 4 since 1995.怎么翻译?
A.must be B.may have been C.can have been D.could be ,为什么呢,
may not have been...与 may have not been ...
may have been怎么用
May I have a book?翻译
Contributing
翻译 May you Have
could have been 和may have been 有什么区别?
may have been 和may have done的区别,特别是may have been doing和may h