It is uncertain __side effect the medicine will bring about,although about two thousand patientshave taken it .这道题答案是WHAT,我想问为什么不能用WHETHER ,求详解

it's uncertain ______ the experiment is worth doing为什么不能用that 英语翻译No trading when it is uncertain.或者语法错误.希望简洁一点..... ——— is uncertain now.A.where did she put it B.where she put it求语法点. life is so peculiar .so uncertain .how little a thing it take to destroy you or save you 意思 It's uncertain ______ the experiment is worth doing.A.if B.that C.how D.whether 否定词缀的词不表否定吗比如说it is uncertain that 的反义疑问句用isnt阿 life is so peculiar .so uncertain .how little a thing it take to destroy you or save you it is uncertain 后用that还是wehther,这两个词分别在什么情况下用? it is uncertain ( ) side effect the medicine will bring about,although about two thousandit is uncertain ( ) side effect the medicine will bring about,although about two thousand patients have taken itthatwhathouwhether 英语翻译uncertain whether the port to which it is bound can be reached,and prevented by many impediments from returning to that it has quitted The history of April Fool's Day or All Fool's Day is uncertain,but the current thinking is that it The history of April Fool's Day or All Fool's Day is uncertain,but the current thinking is that it if能引导主语从句吗?it is uncertain if he will leave for Beijing tomorrow.这里面的if 必须由whether替换吗? It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~ It is uncertain ______ side effect the medicine will bring about,although about two thousand patients have taken it.A.that B.whatC.how D.whether这题选的是B,如果改成It is uncertain ______ the medicine will bring about side effect...能不能 It is ___whether the film is worth_____.A.sure .It is ___whether the film is worth_____.A.sure ..seeingB.uncertain ...seeingC.not sure...to be seenD.certain ...to be seen It is uncertain side effect the medicine will bring about,although aIt is uncertain ______ side effect the medicine will bring about,although about two thousand patients have taken it.A.that B.whatC.how D.whether为什么不能选D捏 从句难道不 An uncertain number of people were waiting.The （ ）of the election is still uncertain.A.expectationB.possibilityC.developmentD.outcome