We haven't decided if____.A:will we take a field trip B:we take a field trip C:we will take a field trip D:we took a field trip 为什么选C啊?IF在这里是什么词?这句是原因状语从句么?

I haven't decided when we went to the Happy Valley这个句子哪里错了? I haven't decided if I will leave for Beijing tomorrow.l haven't decided ----I haven't decided if I will leave for Beijing tomorrow.l haven't decided ------- ------- leave for Beijing tomorrow. I haven't decided when____(take) a holiday. I haven't decided 1个动词填空,I haven't decided which hotel (choose )to stay at . We haven't decided when we should leave的同义句怎么改We haven't decided when we should leave.(改为同义句）We haven't decided _____ _______ ______ Sorry,I'mafraid we haven't() We haven’t decided _____ and ______ we shall meet next time. We haven't decided on the date for the party.改句意相同We haven't decided ______ _______ hold the party. We haven't decided on the date for the party.改句意相同We haven't decided ______ _______ hold the party. I haven't decided which plane I shall take to Beijing.(保持原句意思）I haven't decided which plane ______ ______to Beijing. I haven't decided whether to go to Japan.（同义句转换）I haven't decided whether _________ _________ _________to Japan. I haven't decided whether l'll go to see the film or not.保持愿意I haven't decided ______ ______go to see the film. I haven't decided whether l'll go to see the film or not.保持愿意I haven't decided ______ ______go to see the film. we haven't decided where to go for our summer vacation this year 改为复合句 We haven't decided where the pipes will be laid.是什么意思.为什么用will be laid I haven't decided where I ____(spend) the coming holiday. I haven't decided if i hand in the money to my teacher.同义句 I'm leaving in an hour and I haven't ____ yet.picked filled decided packed