This old computer must have been of great use to ______did the sc_英语解答

This old computer must have been of great use to ______did the scientific research.
A those B when C whoever D whomever

人气：186 ℃　时间：2020-06-07 07:38:40

解答

C
宾语从句
从句缺少主语
所以是Whoever
也可以用 those who 定语从句