It is no longer a question now _____man can land on the moon

It is useful to be able to predict the extent _____ a price change willaffect supply and demand

Online music providers in China hope to set up a plan that will charge individual users for music

对下列句子中词语的解释，不正确的一项是

Having heard my answer, the master nodded _______ satisfaction, “I’m quite satisfied _____you.”[ ]