It's not his fault? What does it mean?

[Faulty]

English Grammar Tests, Elementary Level

ESL/EFL Test #183 "Modal Verbs (1)", question 4

I really ......... be angry with him. It's not his fault.

(a) haven't
(b) have
(c) shouldn't
(d) couldn't have

English Grammar Tests, Elementary Level

ESL/EFL Test #183 "Modal Verbs (1)", answer 4

I really shouldn't be angry with him. It's not his fault.

Correct answer: (c) shouldn't
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fault

[Alan]

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Hi,

In this sentence 'fault' suggests 'failing' or 'mistake'. It's not my fault means I can't be blamed for what has gone wrong.

Alan
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English as a Second Language
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