Persist in and insist on?

[Alfred]

Test No. incompl/inter-23 "Leave me alone", question 8

User: Yes, they would do if you didn't ......... in asking questions.

(a) continue
(b) persist
(c) insist
(d) pursue

Test No. incompl/inter-23 "Leave me alone", answer 8

User: Yes, they would do if you didn't persist in asking questions.

Correct answer: (b) persist

Your answer was: incorrect
User: Yes, they would do if you didn't insist in asking questions.
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Why insist doesn't fit ?

[Alan]

The verb is insist ON.
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English as a Second Language
You can read my ESL story Present Simple

[Deborah]

[Saneta]

why can't it be: continue? thanks

[Alan]

Hi Saneta,

If you used 'continue' in the test, it would have to be: 'continue asking/continue to ask.

Alan
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English as a Foreign Language
You can read my EFL story Progressive Forms