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It is proved that John is really not so good at the job.He n

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It is proved that John is really not so good at the job.He needs ___ by someone who can do it
A replacing B replace C be replaced D to be replaced
It is proved that John is really not so good at the job.He n
D.被可胜任的人替换掉
A 现在分词.后面不能跟by
B 动词原形,两个实意动词不能连续出现.
C need作为实意动词,need to do sth or need sth
作为情态动词,need do sth .但是这里need 如果是情态动词,应该是原形.
D 作为实意动词,need必须根据三单规则,加s.