Went to the conference last week

[Guest]

Test No. errors/advan-2 "Please, remind me", question 4

Foreign ministers from the six countries involved have gone to the conference last week.

(a) ministers
(b) have gone
(c) to
(d) last week

Test No. errors/advan-2 "Please, remind me", answer 4

Foreign ministers from the six countries involved went to the conference last week.

Correct entry: went
The error was: (b) have gone
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what's the answrer?

[Alan]

Here you need the Past Simple went and not have gone.
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English as a Second Language
You can read my ESL story Present Simple

[Tien_Tran]

Can I change "last week" into "since last week"?? So the present perfect "have gone" can fix this sentence???
The sentence will be:
"Foreign ministers from the six countries involved have gone to the conference since last week."

[Khetu]

Foreign ministers from the six countries involved went to the conference last week.

Correct entry: went
The error was: (b) have gone

You have found the error but your entry is incorrect.
your sentence:
Foreign ministers from the six countries involved had gone to the conference last week.

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I am a bit confused. I agree that "went" can be used but I want to know why "had gone" cannot be used?