I think I (forget) _______________________________ to buy some bread ...

★ Present Perfect

I think I (forget) _______________________________ to buy some bread

A. I think I has forgotten to buy some bread

B. I think I have forgot to buy some bread

C. I think I have forgotten to buy some bread

D. I think I has forgot to buy some bread

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choose the grammar structure of present perfect

A. subject , have +simple past verb

B. subject+have-has verb+past participle verb

C. subject+past participle verb +have has

D. subject + has +past participle ver