More than and as much as

[Guest]

Test No. incompl/advan-79 "GMAT Verbal Quiz (2)", question 9

I think you have been overcharged for that work because it's more ......... twice what I had to pay.

(a) as
(b) at
(c) like
(d) than

Test No. incompl/advan-79 "GMAT Verbal Quiz (2)", answer 9

I think you have been overcharged for that work because it's more than twice what I had to pay.

Correct answer: (d) than

Your answer was: incorrect
I think you have been overcharged for that work because it's more as twice what I had to pay.
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How come must i use THAT

[Alan]

The form for comparisons is:

AS much AS ...

More THAN
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English as a Second Language
You can read my ESL story Phrasal Verbs/take