请问This is a piano it is ____ king of the musical instruments.空格里填定冠词 不定冠词 还是零冠词 为什么

请问This is a piano it is ____ king of the musical instruments.空格里填定冠词 不定冠词 还是零冠词 为什么 this is a piano怎么变复数 _____ is very difficult to play the piano very well for the little o._____ is very difficult to play the piano very well for the little boy.A.That B.This C.I D.It this is the real piano on which this is a m____,it is yellow This is a watch.Is it (you)? linda is going to have a piano lesson this Fri-day改为一般疑问句 linda is going to have a piano lesson this Fri-day改问为一般疑问句 请问what is this is English?的答句是It's telephone还是It's a telephone.请说明为什么. i___（have)a piano lesson this weekend Hello!Who is speaking?Hi ,Ann （）Mary.A This B It is C This is DThat is请问是选A还是选B?请说明原因, It is a funny time to play the piano.改为感叹句 (is.it)this a wastebasket?no.it(is.isn't ) it this a doctor?is this a nurse?选择疑问 I must - - - - - - - this:it is a secret this is a house.it has [ ]windows. This is a (c )game.Ilike it --- () is this?--It's a pencil