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_____ 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

试题分析:句意:毫无疑问,在飞机着陆前,你要坐着,系紧安全带。这里使用了固定句型:It is no doubt that…“毫无疑问…”,that连接的是同位语从句,如果是There is doubt后面用whether连接宾语从句,所以选C。
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