单选题 Professor John"s lecture on the recycling of waste paper and other garbage will show______can still be improved.

A、 that the municipal authorities have done
B、 how those the municipal authorities have done
C、 how what the municipal authorities have done
D、 that how the municipal authorities have done

【正确答案】 C

【答案解析】解析：句意：约翰教授关于废纸和其他垃圾回收利用的报告指出该如何对市政府已做的工作加以完善。“how what the municipal authorities have done can still be improved”是句子中的宾语从句，而这个从句中“what the municipal authorities have done”是主语，what是该主语从句中的宾语。