【正文】
1. Germany invaded Poland. The British declared war. A. If Germany hadn’t invaded Poland, the British wouldn’t have declared war. B. If Germany had invaded Poland, the British wouldn’t have declared war. 2. The soldiers reached the beach. They were attacked by the Germans. A. If the soldiers had reached the beach, they wouldn’t have been attacked by the Germans. B. If the soldiers hadn’t reached the beach, they wouldn’t have been attacked by the Germans. √ √ 3. The water was very deep. It was impossible for the soldiers to walk to the beach. A. If the water hadn’t been so deep, it would have been possible for the soldiers to walk to the beach . B. If the water hadn’t been so deep, it would have been impossible for the soldiers to walk to the beach . 4. The invasion of Normandy was successful. The war ended soon afterwards. A. If the invasion of Normandy hadn’t b