Meaning of "wrong number"

[Fogot]

English Error, Elementary Level

ESL/EFL Test #9 "Sorry, Wrong Number", question 5

Really? So, this must be the wrong number than?

(a) must
(b) wrong
(c) than

English Error, Elementary Level

ESL/EFL Test #9 "Sorry, Wrong Number", answer 5

Really? So, this must be the wrong number then?

Correct entry: then
The error was: (c) than
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I'm sorry, "wrong number" in Korean

Fogot

[Alan]

Hi,

Wrong number means the incorrect telephone number.

Alan
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English as a Second Language
You can read my ESL story Prepositions