练习册

  • 练习册
  • 试题
    Despite much research, there are still certain elements in the life cycle of the insect that not fully understood. A. are B. were C. is D. was 【查看更多】

     

    题目列表(包括答案和解析)

    Despite much research, there are still certain elements in the life cycle of the insect that _______ not fully understood.
     A. are    B. were   C. is     D. was

    查看答案和解析>>


    同步练习册答案