________ is now no ________ that global warming is a security threat to us all.
| A．There；doubt |
| B．There；need |
| C．It；doubt |
| D．It；need |
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________ is now no ________ that global warming is a security threat to us all.
| A．There；doubt |
| B．There；need |
| C．It；doubt |
| D．It；need |
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