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
This old computer must have been of great use to ______did the scientific research.
This old computer must have been of great use to ______did the scientific research.
A those B when C whoever D whomever
A those B when C whoever D whomever
英语人气：203 ℃时间：2020-06-07 07:38:40
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