Mark the letter A, B, C, or D on your answer sheet...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

Immediately after his arrival home a water-heater exploded.

A. Hardly had he arrived home than a water-heater exploded.

B. No sooner had he arrived home than a water-heater hadexploded.

C. Hardly had he arrived home when a water-heater exploded.

D. Scarcely he arrived home when a water-heater exploded.