Diffrence between object and subject in this sentence?

[Ali]

Synonym Search, Intermediate level

ESL/EFL Test #125 "Synonyms for task and duty", question 3

What's the ......... of your homework? What's the topic you've got to write about?

(a) object
(b) subject
(c) subjective
(d) argument

Synonym Search, Intermediate level

ESL/EFL Test #125 "Synonyms for task and duty", answer 3

What's the subject of your homework? What's the topic you've got to write about?

Correct answer: (b) subject
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WHAT IS THE DIFFRENCE BETWEEN OBJECT AND SUBJECT IN THIS SENTENCE?

English Learner ALI

[Alan]

Hi,

'Object' could suggest 'purpose' 'Subject' is the theme or topic -subject matter of the work.

Alan
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English as a Second Language
You can read my ESL story The Name of the Game