They will never succeed,__hard they try.A because B however C whe_英语解答

They will never succeed,__hard they try.A because B however C when D since
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人气：465 ℃　时间：2019-08-20 20:31:40

解答

B
无论他们多么努力地尝试,他们都将无法成功.
however无论多么.
whatever无论什么
whenever无论什么时候