I didn’t know that you were at home. I didn’t drop in. Not knowing that you were49/50Mark 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. I didn’t know that you were at home. I didn’t drop in.Not knowing that you were at home, but I still dropped inI didn’t know you were at home although I didn’t drop inNot knowing that you were at home, I didn’t drop inIf I knew that you were at home, I would drop inGiải thíchĐáp án C