We had planned everything carefully. A lot of things...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
We had planned everything carefully. A lot of things went wrong.
A. Although we had planned everything carefully, a lot of things went wrong.
B. A lot of things went wrong but we had planned everything carefully,
C. It is not easy to make every things wrong.
D. We had planned everything carefully so a lot of things went wrong.