选a,这个应该只要根据意思来选就可以了.
整句话的意思是:当有需要的时候不要害怕开口询问信息.
Don't be afraid of asking for information _ it is needed
Don't be afraid of asking for information _ it is needed
a.when b.unless
a.when b.unless
英语人气:482 ℃时间:2020-03-28 17:42:40
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