The fire-fighters made every effort to put off the flames. The building burned down completely

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Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines the pair of sentences given in each of the following questions.

The fire-fighters made every effort to put off the flames. The building burned down completely.

The building burned down completely though the fire-fighters made every effort to put off the flames.

Had it not been for the fire-fighters’ every effort, the building would have burned down completely.

Making every effort to put off the flames, the fire-fighters completely burned down the building.

Since the fire-fighters made every effort to put off the flames, the building burned down completely

Giải thích

Đáp án A

Nghĩa câu đã cho: Những người lính cứu hỏa đã nỗ lực dập tắt ngọn lửa. Toàn nhà đã bị thiêu rụi hoàn toàn. => Hai vế chỉ sự tương phản, nhượng bộ

=> Đáp án là A. Athough ( mặc dù ), nối hai mệnh đề chỉ sự nhượng bộ.