The extent to which the crash will be investigated remain ...
你係咪唔明"The extent to which the crash will be investigated remains to be seen" 點解,定係唔明 in the PAST there has been a TENDENCY in China to......
Fyi,呢兩句要一齊睇
呢段究竟邊句明示或暗示佢話今次中國會沿用一貫調查手法?佢只係話中國以前有咁嘅傾向(tendency)...完全冇講今次,今次調查方式,以作者講,係有待觀察(remains to be seen)