问题描述：
one little question about english
The seasonal nature of the industry’s work demanded that the timing of training courses ________ carefully selected.A) wasB) had beenC) beD) were
为啥是C?
类似的词都有哪些呢？希望全一些，
The seasonal nature of the industry’s work demanded that the timing of training courses ________ carefully selected.A) wasB) had beenC) beD) were
为啥是C?
类似的词都有哪些呢？希望全一些，
问题解答：
我来补答展开全文阅读