【B】       The pandemic has underlined the extent __21__ digital interaction is no substitute for the realthing. In some ways, I’m more in touch with people than ever thanks to the numerous WhatsAppgroups that revived themselves into a constant source of company. But __22__ away in a couple ofgroup chats while absent-mindedly watching the latest Netflix offering doesn’t come close to thewonderful feeling of hugging a friend, or of spending three hours giving someone you haven’t seenfor ages your undivided attention over a meal, or of having a conversation based not just on words butphysical cues. I doubt the pandemic will seed a long-term distaste for crowds； if anything, I suspectthat, if all goes well with the vaccine __23__ , the coming summer will see a crop of riotous streetparties and carnivals.        But a return to life as usual will not mask the emotional toll Covid __24__ on so many people.People who suffer from anxiety and depression, women in abusive relationships, childrenexperiencing abuse or neglect at the hands of their parents: they have had it the worst, and theirexperiences of isolation and loneliness during lockdown could have consequences for their personalrelationships that will not magically disappear with a vaccine.
       And that is before you factor in the added __25__ of the intense financial hardship so many arebeing forced to endure. As a society, recovering from Covid is about much more than antibodies: itcannot happen without support for those who have experienced its worst financial and mental healthimpacts.
【題組】21.
(A) to which
(B) for which
(C) of which
(D) by which