Final answer:
The sentence 'Can he......... (Read) this story yet.' should be completed with 'has not read' to correctly form the present perfect tense and convey that the action has not been completed up until now. The correct option is a. Has not read.
Step-by-step explanation:
The correct answer to fill in the blank in the sentence 'Can he......... (Read) this story yet.' with the options given would be 'Has not read.' This is because the question is asking if an action has been completed at some point in the past up to now, which requires the present perfect tense.
The present perfect is formed with the auxiliary verb 'have' (has for he/she/it) followed by the past participle of the main verb, in this case, 'read' which is both the present and past participle form. So, the complete sentence should read, 'Can he has not read this story yet.'