Don’t be afraid of asking your teachers for help ________it is needed.
A．a(chǎn)sB．since
C．unlessD．when
D
解析　考查連詞。句意為：如有需要，不要害怕向老師求助。此處when相當(dāng)于if，表示條件，其他不符合語(yǔ)意。
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