Though things are going smoothly now, scientists are still in doubt ________.
| A．that people with the virus can be cured | B．where did the virus come from |
| C．if the virus is influenced by the weather | D．how long people have caught the virus |
2021·江苏无锡·一模 查看更多[10]
更新时间：2022-05-29 15:43:33
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