If a man _________ succeed he must work as hard as he can.A.will B.should C.is to D.is going要真确的..要理由急.

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If a man _________ succeed he must work as hard as he can.A.will B.should C.is to D.is going要真确的..要理由急.

If a man _________ succeed he must work as hard as he can.A.will B.should C.is to D.is going要真确的..要理由急.
If a man _________ succeed he must work as hard as he can.A.will B.should C.is to D.is going
要真确的..要理由急.

If a man _________ succeed he must work as hard as he can.A.will B.should C.is to D.is going要真确的..要理由急.
选B
这是一个条件状语从句,遵循主将从现原则,主句用情态动词must代替将来时,
从句要用一般现在时,而选项ACD均是将来时,所以从句if后面仍然以情态动词should来代替一般现在时
(我见到有人说虚拟语气的,首先这个不是虚拟语气,因为succeed虽然看起来像过去式,但是它是原形)
(选C也不对,因为be to do指的是立即将要发生,从语法结构,意思上都不对)