I did not see Tim off at the airport. I feel bad about it now. I could have seen50/50Mark 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 did not see Tim off at the airport. I feel bad about it now. I could have seen Tim off at the airport If only I had seen Tim off at the airport That I did not see Tim off at the airport escapes me now It suddenly dawns on me that I should have seen Tim off at the airport Giải thíchChọn B