Question

I have been waiting – 5 o'clock​

Answer 1

Answer:

she has been waiting – 5 o'clock

Answer 2

I have been waiting since 5 o'clock​.

• Verbs that are present in a sentence can be of three major types. These verbs represent situations that had occurred in the past,  situations that are currently occurring in the present and situations that may occur in the future. Actions occurring in the past is describe as past tense, action occurring presently in the present tense and actions which is yet to occur, is mentioned in the future tense. These verbs cannot be followed by what is known as prepositions.
• Prepositions are specific words that are generally used in front of or before nouns or noun phrases in order to provide the description for the position of certain objects or the time or the locale, etc. The common prepositions are on, in, off, between, at, etc.

Here, according to the given information, we are given that,

I have been waiting ____ 5 o'clock​.

Here, the sentence with the appropriate preposition is,

I have been waiting since 5 o'clock​.

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