— I wonder why he has been acting so strange these days.—Recent pressure at work may his

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A. account for
B. make for
C. change for
D. stand for
解析：   account for对某事物做出解释，解释事情的原因。make for sth.向……移动；促成；change sth.for sth.用某物替换或代替某物；stand for为某物的缩写形式；代表；赞同。