A good friend always gives you a helping hand you're in trouble A)when B)before C)until D)though可是D也翻得通啊.难道是时态的问题?

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A good friend always gives you a helping hand you're in trouble A)when B)before C)until D)though
可是D也翻得通啊.难道是时态的问题?

when
引导时间从句
意为:在你有困难的时候,好朋友总是会给你以援手.
毕竟前后没有转折意味,不用though.