_____ is no doubt ______ you have to remain seated and fasten your seatbelt before the plane lands.
A．There; whetherB．It; thatC．There; thatD．It; whether
C

試題分析：句意：毫無疑問，在飛機(jī)著陸前，你要坐著，系緊安全帶。這里使用了固定句型：It is no doubt that…“毫無疑問…”，that連接的是同位語從句，如果是There is doubt后面用whether連接賓語從句，所以選C。
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