为什么选if不选becauseShe didn't go to the party last night,_____ she had to finish her term paper.选项是 if,though,till,because

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为什么选if不选becauseShe didn't go to the party last night,_____ she had to finish her term paper.选项是 if,though,till,because 单选____,the experiment will be successful.A.If carefully doneB.If carefully doingC.If it done carefullyD.If doing carefully为什么选A不选D? 为什么不选D 为什么不选D 为什么不选D? 为什么不选D d为什么不选? 为什么不选D? 为什么不选D? 为什么不选d 为什么不选D 为什么不选D ,为什么不选D 为什么不选D 为什么不选D The new machine,if ___properly ,will work for at least ten yearsC being used D used为什么不选C If you have ____questions,ask me for help .A.a B.any .C.no D.some 为什么?此句是肯定句啊,为什么不选D. 有关that if,if,和whether的题目.He doesn't care ( )the food is delicious or not.A.that B.that if C.if D.whether有whether or not应该选D吧，可是为什么不选B或者C呢？请解释一下什么时候用that if 或者if 两者的区别。