Don't you think doing morning exercises_ good for us?A.be B.am C.are D.is

Don't you think doing morning exercises_ good for us?A.be B.am C.are D.is
Don't you think doing morning exercises_ good for us?A.be B.am C.are D.is

Don't you think doing morning exercises_ good for us?A.be B.am C.are D.is
D is,这总是一个整体,要用is

这道题选C