it's uncertain ______ the experiment is worth doing为什么不能用that

it's uncertain whether the medicine will work on this cold的反义疑问句是什么? it's uncertain ______ the experiment is worth doing为什么不能用that It's uncertain ______ the experiment is worth doing.A.if B.that C.how D.whether 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 It’s _____ today.Let’s ____. It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~ ____ _____ _____ _____,please?It's ten to nine It 's _____ for people _____ _____ the busy streets It's used for _____ _____ _____(探索太空） 英语翻译What's it used for?It's _____ _____ _____ metal It's cloudy today.的同义句It's _____ _____ _____ today. It's _____ seven twenty.填介词 It's time to ___ _____ It's time to ___ _____ It's u _____ the chair.填空 Let's keep it _____ feeling cold. Children's Day come a _____ it.