what is this It is a pen.还是This is a pen好这个问句碰到选项,该选哪句?

what is this?-It is. What is this?It is This is a book.对book 提问时what is it 对,还是what is this? this is a kind of what it is what colour is this?it is a yellow.改错 What is this?----It is a (l ) for Jane What is this It is a photo.变为复数形式 What is this? It is a box.复数形式 What is this怎么回答,是It is+a/an What is this?是用this isF还是this is a F还是it is F What is it还是What is this回答是：It is a baseball. What is this 是This is a pen.还是.It is a pen?为什么? What is this A.it is a ''Z '' B.it is a ''S '' What is this in english?A This is a bag B It is bag C It is a bag 为什么 what is this?______ a chair.A.is thisB.it is C.that is what is this ?A:(this is M )B:(it is M) What is this?It is （）（）. What is this?it is orange.