Have to vs. must

[dr richa]

Test No. errors/elem-13 "Telephones", question 4

Companies usually have ISDN connections so their telephone number can have much extensions.

(a) have
(b) their
(c) much

Test No. errors/elem-13 "Telephones", answer 4

Companies usually have ISDN connections so their telephone number can have many extensions.

Correct entry: many
The error was: (c) much

You have found the error and your entry is correct.
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explain ques#3 for elementary level 3
ans says "must put" is correct...how??
i feel it is "have to put"

[Torsten]

OK; let's take a look at the test you are referring to:

Test No. errors/elem-13 "Telephones", question 3

If you call from another country you must to put that country's code in before the city code.

(a) call
(b) must
(c) before

Test No. errors/elem-13 "Telephones", answer 3

If you call from another country you have to put that country's code in before the city code.

Correct entry: have
The error was: (b) must
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As you can see the correct answer is have to put that country's code in because this is the construction:

have to + verb.

The modal verb must is not followed by to:

I must go now.
You really must talk to him.

For information on the difference between have to and must you can read these posts:
http://www.english-test.net/forum/ftopic1231.html
http://www.english-test.net/forum/ftopic1169.html
http://www.english-test.net/forum/ftopic1170.html
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary