Covid-19, the most deadly virus in recent years, began to attack people at the beginning of this yea

Covid-19, the most deadly virus in recent years, began to attack people at the beginning of this year, from ________ effect people are still suffering.
A. that B. those C. whose D. what
【答案】C
【解析】
【详解】考查定语从句。句意：新型冠状病毒，近年来最致命的病毒，开始在今年初攻击人类，人们仍在遭受新冠病毒之苦。分析句子可知，此处是“介词+关系词”引导的非限制性定语从句，先行词是Covid-19，指物，关系词在从句中作定语，应使用whose。故选C项。