Pick the correct option to complete the sentence. We have been waiting for you _____ 9 a.m.
Pick the correct option to complete the sentence.
We have been waiting for you _____ 9 a.m.
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Correct answer: (C) since
Explanation
With the present perfect continuous, a point of time (9 a.m.) takes ‘since’; ‘for’ is used with a period of time.