现在完成时的被动语态 — 英语词汇题

Over the past decade, the ancient shipwreck near the South China Sea ___ by unde…

Since the research submersible returned from the newly mapped ridge, every sampl…

根据所给单词的适当形式填空：A new species of deep-sea coral ___ (d…

Since the deep-sea survey began, the revised procedures for labeling water sampl…

The condition of the underwater cables on the research vessel ___ (check) twice …

用所给动词的适当形式填空：Since the marine conservation law came in…