That vs which

[Guest]

Test No. errors/elem-5 "Relative Pronouns", question 6

I think you will see that this is the best museum which you can find in the town.

(a) that
(b) this
(c) which

Test No. errors/elem-5 "Relative Pronouns", answer 6

I think you will see that this is the best museum that you can find in the town.

Correct entry: that
The error was: (c) which

You have found the error but your entry is incorrect.
I think you will see that this is the best museum which you can find in the town.
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when do we use the word which and when we use "that"

[Alan]

Both are used for things - not people. Here you need that because it qualifies a superlative: the best museum THAT ...
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English as a Second Language
You can read my ESL story Subjunctive