Idiom: Are you in on the latest developments?

[Shanthi]

Test No. express/advan-7 "English Grammar Prepositions", question 4

Are you in on the latest developments?

(a) kept informed about
(b) kept attached to
(c) kept told about
(d) kept written to

Test No. express/advan-7 "English Grammar Prepositions", answer 4

Are you kept informed about the latest developments?

Correct answer: (a) kept informed about
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Are you in on the latest developments?

[Mister Micawber]

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In on = informed of/cognizant of.
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Native English teacher at Mister Micawber's

[Haihao]

Hi,

I thought 'be in to' could also mean 'be involved in' so I had chosen (b). Is that impossible?

haihao

[Mister Micawber]

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Yes, impossible: be into is not the same as be in on, and kept attached to does not mean be involved in. In fact, kept attached to would have no meaning in this sentence.
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Native English teacher at Mister Micawber's

[Haihao]

I am sorry for the misspelling of 'in to' for 'in on' but I got the answer I needed from you all the same. Thank you.