________acertaindoubtamongtheworkersastothenecessityoft...

问题详情：

________ a certain doubt among the workers as to the necessity of the work.

A．There existed  B．It existed

C．There had  D．It had

【回答】

A　此处There existed a certain doubt＝There was a certain doubt，是There be结构的变式。

知识点：固定句型

题型：选择题