Don’t be afraid of asking for help _______ it is needed.?
A．unless?
B．since?
C．a(chǎn)lthough?
D．when?
D?
根據(jù)句意可確定選D項(xiàng)，意為“當(dāng)需要時(shí)不要害怕尋求幫助”。unless意為“除非”；since意為“因?yàn)椤保琣lthough意為“雖然”。
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