____the piane will arrive on schedule remains unknown. A.if Bthat Cwhether Dwhen求解、为什么

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____the piane will arrive on schedule remains unknown. A.if Bthat Cwhether Dwhen求解、为什么
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____the piane will arrive on schedule remains unknown. A.if Bthat Cwhether Dwhen求解、为什么
____the piane will arrive on schedule remains unknown. A.if Bthat Cwhether Dwhen
求解、为什么

____the piane will arrive on schedule remains unknown. A.if Bthat Cwhether Dwhen求解、为什么
C wether
首先翻译,先不考虑选项,飞机会准时到达仍然未知,
很显然按照我们说话的习惯应该是飞机是否会准时到达仍然未知.
因此选择含有是否的选项 只能选择AC
但是if不能引导主语从句,这里的从句是做主语的

whether