Don’t be afraid of asking your teachers for help______it is needed.

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问题 Don’t be afraid of asking your teachers for help______it is needed.

选项 A、as
B、since
C、unless
D、when

答案D

解析 句意为“如有需要,不要害怕向老师问问题”。此处when相当于if,表示条件。
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