为什么是remain to be seen 而不是remain to see不是 remain to do

为什么是remain to be seen 而不是remain to see不是 remain to do remain to be 用法 remain to be settled remain doing和remain to do区别remain to do 和 remain to be done呢 several things remain to be remain seated和remain to be seated有什么不同 remain to be done和remain seated 区别. remain seated和remain to be seated有什么不同 remain stuck 和remain to be stuck有什么区别. Please remain( )until the plane has come to a complete stopplease remine____until the plane has come to a complete stop A to seat B to be seat C seating D seated为什么是选D不是C remain to be seen为什么等于appear/seem to be remain to be done是否等于remain doing?need doing是否等于need to be done? there remain some problems to be solved中的remain可以用be代换吗 there will be a friend——here to see me tomorrow.为什么是coming不是come. be glad to see 22.While he was in his college days he used to _______ long hair.为什么是wear 不是remain,grow remain to do remain doing remain to do remain doing