There has to ______ a well-developed system that can give people a warning when a tsunami is ______ the way.
| A．have；in |
| B．be；in |
| C．have；on |
| D．be；on |
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There has to ______ a well-developed system that can give people a warning when a tsunami is ______ the way.
| A．have；in |
| B．be；in |
| C．have；on |
| D．be；on |
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