The problem (whether) this material can be used in our factory has not been solved.这是什么从句?

连词成句come,the,will,problem,he,is,whether _____he worked out the problem puzzled everybody present.请问空格是填 whether 还是 how THX~ they discussed____they could settle the problem without others' help.为什么填whether 不能是if 呢? The problem is ( ) we can finish it.A if B which C whether D what they discussed____they could settle the problem without others' help.为什么只用whether不用ifit's uncertain ______ the experiment is worth doing.为什么也只用whether不用if The problem (whether) this material can be used in our factory has not been solved.这是什么从句? the boy is not sure whether he can_ such a problem care handle catch take选哪个 The problem will appear_a different welfare system will be created.A unless B whether C untill Dif So whether life will contitue on the earSo whether life will contitue on the earth for millions of years to come will depend on whether this problem can be solved.这是个什么从句,为什么? So whether life will continue on the earth for millions of years to come wildepend on whether this problem can be solved分别解释一下第一个和第二个whether 为什么不能用if 一个英语语法问题：whether能否用来引导定语从句?谢谢如：The problem whether it will rain tomorrow remains unknown.若whether不能引导定语从句,则上句应作如何修改? The problem remains the rescue teams could arrive in time.A、if B、whether C、when D、that选什么呢? 这句英语有无语法错误?I have a problem whether I shoule live in the school or not?有的话 错在哪? The problem ______ it is right or wrong has not yet been decided.a.whether b.that如题,名词性从句,选哪个?为什么? －Is there any possibility ______ you could pick me up at the airport?B －No problem.A.When B.that C.whether D.what there any possibility-------you could pick me up at the airport?——No problem.A.when B.that C.whether D.what The problem (whether) this material can be used in our factory has not been solved.A:thatB:whatC:whetherD:why为什么选C? [D28] -Is there any possibility ______ you could pick me up at the airport?-No problem.A.When B.that C.whether D.what请翻译,并分析.