求助一道填空题，一呀么一道题~想了好多次还是想不通

xydxuyidanUID: 3153716

It is ironic that a critic of such overwhelming vanity now suffers from a measure of the oblivion to which he was forever________others, in the end, all his ___________ has only worked aganist him.

第一空选项： A. consigning  B. relegating   C.condemning
第二空选项：D.self-adulation  E. self-sacrifice  F.self-analysis


答案是AD，我主要是第一空不理解，为什么不能选C呢，还有我总是不理解ironic的意义，求解~

WildSwanAtCooleUID: 3060718

据说是习惯表达

苏梳眠UID: 2717864

consign others to oblivion可以当个词组，表示类似“突出自己，使别人失色”。
第一空与overwhelming vanity对应。
ironic的意思，为什么不查MW呢？
iron·ic    adj.
Pronunciation:     ˌī-'rä-nik also i-'rä-
Variant:            also iron·i·cal \-ni-kəl\
Function:           adjective
Date:               1576

1 : relating to, containing, or constituting irony <an ironic remark> <an ironic coincidence>
2 : given to irony <an ironic sense of humor>
synonyms see SARCASTIC
–iron·i·cal·ness \-ni-kəl-nəs\ noun