We can actually infer here that using context clues, the complete form of sentence will be:
Only today did l know that he had lied to me.
What is context clues?
Context clues are actually known to be hints that are gathered from the related information given in a text, passage or paragraph in order to find the meaning of something. Thus, we can deduce that context clues uses information within that passage or sentence to pass an information.
Context clues are helpful because they enable readers to be able to find hints to the answers to their question.
We can see that from the information within the given sentence, the time the speaker discovered that someone lied to him is what is put into consideration.
Learn more about context clues on https://brainly.com/question/11247029
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