you___succeed if you keep up your good work Amust Bwill be sure to Cmust be able Dare sure to选哪一个,为什么?

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you___succeed if you keep up your good work Amust Bwill be sure to Cmust be able Dare sure to选哪一个,为什么?

you___succeed if you keep up your good work Amust Bwill be sure to Cmust be able Dare sure to选哪一个,为什么?
you___succeed if you keep up your good work Amust Bwill be sure to Cmust be able Dare sure to
选哪一个,为什么?

you___succeed if you keep up your good work Amust Bwill be sure to Cmust be able Dare sure to选哪一个,为什么?
选d .这里一般现在时表将来,所以不用将来时,排除b .a选项意思不对. c选项用错了,be able to do , 可排除.

A,must+动词原形表示推测,而且可能性很大

怎么没有选项呢

选D.根据题目的意思应该是“如果你……,你一定可以成功。”A是主观的“必须”,不符合;C的表达明显不对;而且这里应该要用一般现在时表将来,B不对。