Don’t be afraid of asking for help _______ it is needed.
A．unlessB．though
C．a(chǎn)lthoughD．when
D

試題分析：考查連詞。A. unless除非；B. though盡管；C. although盡管；D. when當...時候；此處when相當于if，表示條件；句意：如有需要，不要害怕向老師求助。故D正確。
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