作业帮he has been ___the research in monsters ever since选项A diving into B dived to C being dived D dived into
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he has been ___the research in monsters ever since选项A diving into B dived to C being dived D dived into
he has been ___the research in monsters ever since
选项A diving into B dived to C being dived D dived into
he has been ___the research in monsters ever since选项A diving into B dived to C being dived D dived into
答案该选A
用现在完成进行时：表示从过去某时开始一直持续到现在的动作,并且还将持续下去.
dive into有热切的加入或开始做某事的意思
这句话是说:从那时候起（直到现在）他都在进行有关怪物的研究工作.
选A
根据短语ever since 从那时到现在
所以他的行为动作是持续的，所以从A 和C里面选
因为动作是主语发出的，所以不需要用被动，所以选择A
A
A
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