1.____great help he's given us!let's go and thank him.(为什么用w

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1.____great help he's given us!let's go and thank him.(为什么用what a不能用what?)
2.I would like to fly economy class.(对economy class进行提问）
_____ ______would you like to fly?（为什么是what class,不是which class?)

1.抽象名词具体化吧……help做名词本来不可数,但是被赋予了一个具体的含义,即他给予我们的、具体的帮助,所以用what a
2.which用于有范围的情况下,通常说来是划定了一个范围让你在其中选择,而题目只是很笼统的说“economy class",并没有突出“选择”的概念,所以用what

Let's go and ask Mr Li for help.He __(possible) can give us ____great progress he has made!And it's ____great success. 改错：1.Let's go and have a long at they.2.Let's go and help he 几道英语选择,Let's go and help him,( )he can't finish the work on Let's( )him,ok?A:go help B:go and help C:go helping D:to go It's a nice bookmark.Where's he?Let's go and ask him.Look!Wh Let's go and ( ) hello to him Let's go and a( )him. Let's go and ____hello to him. let's help him with Chinese 为什么要用with He's ___ trouble.Let's help him. let's ask Mr.wu ( ) (him) can help us.