He ______ for two hours when I reached there.

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**Solution:**

1. The sentence describes an action that started in the past and continued for some time before another past event.

2. The phrase "for two hours" indicates the duration of the action before the event "when I reached there".

3. The correct tense to express an action continuing up to a point in the past is the **past perfect continuous tense**.

4. The past perfect continuous tense is formed as: _had been_ + _verb-ing_.

5. Therefore, the correct sentence is: "He **had been waiting** for two hours when I reached there."

**Answer:** A) had been waiting

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