Don't be afraid of asking for help ______it is needed.

A．whenB．a(chǎn)fterC．a(chǎn)lthoughD．unless

A

解析試題分析：A. when 當……的時候；B. after在……之后；C.although 僅管；雖然； D. unless除非；如果不。句意：當有必要的時候，不要害怕尋求幫助。結(jié)合語境可知選A。
考點：考查連詞的辨析。

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