I think ____ necessary for students to master a foreign lang

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I think ____ necessary for students to master a foreign language.
A.it B.its C.that
答案是A.为什么念起来不对的感觉?总觉得应该是it's才对~

it和it's都可以
I think it necessary for students to master a foreign language.
it 做形式宾语 for students to master a foreign language做实际宾语.
这是使用了think +形式宾语＋实际宾语的复合结构.
I think (that) it is necessary for students to master a foreign language.
这是think 接宾语从句.
只是结构不同意思差不多而已.

I think ____ necessary for a student to master a foreign lan I.think ____ necessary for students.to take an interest in a I don't think ____ possible to master a foreign language wit It is necessary for us to master a foreign language.请问for us It is difficult for ____ foreign language beginner to master I don't think ( )possible to master a foreign language witho I think that it is important to master a foreign language.(同 I don't think it possible to master a foreign language witho I think that it is important to master a foreign language.(改 I don’t think possible to master a foreign language _______ I think that it is important to master a foreign language.（同英语改为简单句I think it is important to master a foreign language.