问题
选择题
_____ a certain doubt among the workers as to whether he could finish the task in a short time．
A．It was
B．There had
C．There existed
D．It had
答案
答案：C
There existed为there be句型的变体意为“有”。句意：关于他是否能在短时间内完成这项任务在工人中存在着某种怀疑。