It remains________whether herd immunity that most of the Europeans countries have taken in response to the epidemic works.
| A．to see | B．to be seen | C．seeing | D．being seen |
更新时间：2020-07-23 16:16:16
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【知识点】 不定式的被动语态
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【推荐1】With so many residents ______, the medical testing company will have a hard time in the following weeks.
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