At the meeting the chairman requested that all the members______ this problem carefully.1.had studied2.study3.would study4.studied

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At the meeting the chairman requested that all the members______ this problem carefully.1.had studied2.study3.would study4.studied

At the meeting the chairman requested that all the members______ this problem carefully.1.had studied2.study3.would study4.studied
At the meeting the chairman requested that all the members______ this problem carefully.
1.had studied
2.study
3.would study
4.studied

At the meeting the chairman requested that all the members______ this problem carefully.1.had studied2.study3.would study4.studied
2.request that.(should)do sth.固定用法,答案省略了should ,后面应用动词原型

2,省略了should

2.study
request that -------(should) do

跟suggest一样,省略了should,选2

选2 本应该是should study ,这里省略了。考试就是这样的,要转个弯