单选 求详细解释~

解题思路： 但在英语中用现在完成时的被动语态代替 现在完成进行时的被动语态解题过程： In the past half one year, a discussion _______about whether selecting “Three Goods” Students in elementary and middle schools should be cancelled。 A。 has to be held B。 has been held C。 has been holding D。 was held 请问老师这题为什么一定要选C，选B错在哪呢？discussion 和hold之间不应该是被动吗？选C不就成了主动了吗？ 答：此题应选 B。 has been held 你的考虑是对的，discussion 和hold之间应该是被动 In the past half one year此题本应用现在完成进行时的被动语态，（一直在被讨论）但在英语中用现在完成时的被动语态代替 现在完成进行时的被动语态We had no food left in our backpacks, and ______ matters worse, it began to pour A。 making B。 to have made C。 having made D。 to make 请问老师为什么一定要选D，而其它选项是错的？ 答：to make matters worse使情况更糟的是，是固定短语，又如 To tell you the truth,it is interesting to learn English。最终答案：略