My friend___know his pen pal's hobby.A.an not B.isn't C.don't D.doesn't

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My friend___know his pen pal's hobby.A.an not B.isn't C.don't D.doesn't
My friend___know his pen pal's hobby.
A.an not B.isn't C.don't D.doesn't

My friend___know his pen pal's hobby.A.an not B.isn't C.don't D.doesn't
答案:D 助动词否定形式.his表明My friend是单数,所以do用单数
全文:我朋友不知道他笔友的习惯.

c,原句中缺少一个谓语,用助动词do,又因为主语单三而且是一般现在时

D.doesn't my friend 第三人称单数

选D
第三人称单数形式

TAdoesn't

doesn't D.
我朋友不知道他笔友的爱好。
第三人称的否定式。