the question is（ that if ）it is worth doing that if 为什么不能用在这里,只能用whether

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• the question is（ that if ）it is worth doing that if 为什么不能用在这里,只能用whether
• the question is（ that if ）it is worth doing that if 为什么不能用在这里,只能用whether
• The question is whether it is worth doing.有人说if不能引导表语从句,为什么呢?if也有"是否"的意思啊比如,如题的句子,不可以换为：The question is if it is worth doing. 吗?
• we will discuss the question tomorrow改成被动句 怎么改
• It's uncertain _____the experiment is worth doing.能用if吗!又说whether可以的!到底选哪个?我想问个清楚!网上有的说if可以引导主语从句,有的又说不能,我想要个正确的答案!到底能不能!如果能的话下面这道题应该怎么做!It's uncertain _____the experiment is worth doing.A.if B .that C.whether D.how