Get used to having colleagues in the same office

[kris]

Test No. errors/inter-3 "Sally and her Letter", question 7

After years of working at home he now cannot get used to have colleagues in the same office.

(a) After
(b) working
(c) have
(d) the same

Test No. errors/inter-3 "Sally and her Letter", answer 7

After years of working at home he now cannot get used to having colleagues in the same office.

Correct entry: having
The error was: (c) have

You have found the error and your entry is correct.
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Could you exlain why use HAVING after TO? but not HAVE?
thanks!

[Alan]

There are 2 constructions: She used to smoke (she did this in the past but doesn't now).

She is used to working long hours (she is accustomed to working long hours - it is usual for her).
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English as a Second Language
You can read my ESL story Only Three Letters