I didn’t quite follow him because he explained the theory _____that is too abstract for me.
PRC is ________the People's Republic of China.
—If you're free tonight, I'd like to invite you to a movie.—That's nice of you, but are you________?
Since it's raining, it would ________to stay at home and play cards.
John plays football________, if not better than, David.
从题中所给的A、B、C、D四个选项中选出一个最佳答案。You can't come in without a________.A.permission B.permitC.being permittedD.permitted