Indicate the correct answer:__ number of boys were swimming in the lakeĐoạn văn9/40Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. ______ number of boys were swimming in the lake, but I didn’t know ______ exact number of them.A/theThe/anThe/theA/anGiải thíchĐáp án A.