“Through thick and thin” is a（n）（ ）.

“Through thick and thin” is a（n）（ ）.
A、verbal idiom in nature
B、nominal idiom in nature
C、sentence idiom
D、adverbial idiom in nature
【正确答案】：D
【题目解析】：through thick and thin 是指 through all difficulties and troubles，是一个副词性习语，表示“在任何困难的情况下”。