How long _ you _ this strange behavior of his?
Correct answer: C. Have, been noticing
- A. Are, noticing
- B. Do, notice
- C. Have, been noticing
- D. Had, noticed
Explanation
The correct answer is have, been noticing because the structure 'have been noticing' indicates an action that started in the past and continues into the present, which fits the context of the sentence. The phrase 'How long' suggests a duration of time that extends from the past to the present, requiring the Present Perfect Continuous tense. The other options use incorrect tenses: 'are, noticing' suggests an action happening right now, 'do, notice' describes a habitual action in the present, and 'had, noticed' implies a completed action in the past, none of which fit the context of the question.
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