trouble 常用词组
①get into trouble陷入困境
②have trouble/difficulty/problems with sth. =have trouble/difficulty/problems （in)doing sth.
做某事有困难
③ask for trouble 自寻烦恼
④in trouble 陷入困境
eg：－Sally is my best friend. She is always there wheneve.I'm________.
－Yeah. A friend in need is a friend indeed.
A.in order
B.in trouble
C.in public
解析：本题用短语辨析法。根据答句后一句句意"患难见真情。"可知每当"我"身陷困境时，她总是在那里（帮助"我"）。
in order 按次序，井然有序；
in trouble陷入困境；
in public 在公共场合。
所以选B。
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