题目内容

Jack ___________ his homework after lunch.

[  ]

A.isn't do
B.doesn't
C.don't do
D.doesn't do
答案:D
解析:

分析 A项错,否定实义动词应用助动词donot形式,不能用benotB项错,doesn't是助动词用来否定实义动词,不能单独作谓语。C项错,助动词do有人称和数的变化。本句主语为第三人称单数,应用doesn't,所以D对。


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