a. か b. で c. に d. も
The sentence without the brackets means “I went to Kyoto 10 times” and it is OK as it is. However, if I want to emphasize “10 times” and say “as many as 10 times” then I would add d. も there.
John ate as many as 5 hamburgers.
I slept as long as 12 hours yesterday.
Emma knitted as many as 8 jumpers.
Jan has as many as 9 siblings (brothers and sisters).
Meg wrote a report as many as 10 pages long.
What? Do you have 3 sugars in your coffee?
Toshi runs as long as 10 km every day.
Note that this も is always used after a number + counter.
も in the meaning of “too” or “also”
John also ate 5 hamburgers.
Emma knitted 8 jumpers also (as well as something she knitted 8 of).
Jan also has 9 siblings (as well as somebody else who has 9 siblings).
Toshi also runs 10 km every day.
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