問題詳情
5. The world’s richest, most powerful country has almost 20 million vaccine doses that are sitting_________. Meanwhile, people are desperately trying to sign up and often failing.
(A)misused
(B) overused
(C) underused
(D) unused
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增