_____ is no doubt ______ you have to remain seated and fasten your seatbelt before the plane lands.
| A．There; whether | B．It; that | C．There; that | D．It; whether |
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_____ is no doubt ______ you have to remain seated and fasten your seatbelt before the plane lands.
| A．There; whether | B．It; that | C．There; that | D．It; whether |
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