Must or have to

[Guest]

Test No. incompl/elem-7 "Modals", question 3

I ......... go now because I am already late for my class.

(a) must
(b) had
(c) have

Test No. incompl/elem-7 "Modals", answer 3

I must go now because I am already late for my class.

Correct answer: (a) must
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Hi,
we cannot use have to here because we didn't have it onto our answer. Where are you take it please? Thanks for the answer

[Torsten]

Hi Guest,

I must go is the correct answer here because as you pointed out the option have to is not available.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary