160.A good friend is one who will __ you when you are in trouble.-|||-A.stand for B.stand by C.stand up to D.stand out

本题考查动词短语辨析，核心在于理解不同短语的固定搭配及具体含义。关键点在于区分"stand by"与其它选项的细微差别，需结合语境判断"朋友在困难时应采取的态度"。

选项解析

A. stand for
意为"代表、象征"（如：What does "CEO" stand for?）或"容忍"（如：I won't stand for such rude behavior.）。与句中"帮助"无关。

B. stand by
表示"支持、帮助"，尤其指在困难时期不离不弃（如：A friend will stand by you when you're down.）。符合题意。

C. stand up to
意为"勇敢面对、对抗"（如：She stood up to the bully.）或"经得起考验"（如：This material can stand up to rough use.）。与"帮助"无关。

D. stand out
表示"突出、显眼"（如：He stood out in the crowd.）或"表现优异"（如：She stood out among all candidates.）。与句中情境不符。