问 1+1=几?的时候 ,是 what {are} one and one ? ,还是 what {is} one an

问 1+1=几?的时候 ,是 what {are} one and one ? ,还是 what {is} one an what is one and one? what is one and one 的回答 What is one one? What's one and one? what's one and one If one @ one means one and one plus one,what is 3 @ What's one and one?(重写） ------- ------ ------ one and one? What's one and one?这个句子中的助动词为什么要is,不能are? one world one dream,and what is the dream? What is one bitch? what’s one third and one half