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She has been ..... the computer since this morning.

Aon

Bin

Cof

Dto

Answer:

A. on

Read Explanation:

phone,computer,T.V എന്നൊക്കെയുള്ള devices നു മുന്നിൽ on എന്ന preposition ഉപയോഗിക്കുന്നു.


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