The correct answer is: E. No error
The sentence is grammatically correct. The verb “was” agrees with the subject “I” in the simple past tense. The subordinating conjunction “when” introduces a clause that describes the time when the action of the main clause took place. The past participle “heard” is used as an adjective to modify the noun “that.” The past participle “left” is used as an adjective to modify the noun “country.” The prepositional phrase “without informing anyone of us” modifies the verb “had left.”
Here is a breakdown of each option:
- Option A: “I was being astonished” is grammatically correct. The verb “was” agrees with the subject “I” in the simple past tense.
- Option B: “when I heard that” is grammatically correct. The subordinating conjunction “when” introduces a clause that describes the time when the action of the main clause took place.
- Option C: “he had left the country” is grammatically correct. The past participle “left” is used as an adjective to modify the noun “country.”
- Option D: “without informing anyone of us” is grammatically correct. The prepositional phrase “without informing anyone of us” modifies the verb “had left.”
- Option E: “No error” is the correct answer. The sentence is grammatically correct.