begin有哪些用法?-我知道有begin to do 和begin doing.但在They are begining ( )that man is different from animals because he can speak.A.understand B.know C.to understand D.knew.中选哪个?理由是什么?这个句子是宾语从句吗

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begin有哪些用法?-我知道有begin to do 和begin doing.但在They are begining ( )that man is different from animals because he can speak.A.understand B.know C.to understand D.knew.中选哪个?理由是什么?这个句子是宾语从句吗
begin有哪些用法?
-我知道有begin to do 和begin doing.但在They are begining ( )that man is different from animals because he can speak.A.understand B.know C.to understand D.knew.中选哪个?理由是什么?这个句子是宾语从句吗,主句为现在进行时,从句要什么时态.如何辨别宾语从句的时态?

begin有哪些用法?-我知道有begin to do 和begin doing.但在They are begining ( )that man is different from animals because he can speak.A.understand B.know C.to understand D.knew.中选哪个?理由是什么?这个句子是宾语从句吗
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