What is Jack _____(A.do B.does C.doing)?He is ____(A.eating B.ate C.eat) his breakfast.）
问题描述：
What is Jack _____(A.do B.does C.doing)?
He is ____(A.eating B.ate C.eat) his breakfast.）
答
He is eating his breakfast..eating是进行时，ate是过去式，eat是未来
答
doing
eating
现在进行时：系动词be+doing
答
doing
be doing 这是固定搭配 现在进行时
eating
同上 这也是现在进行时 表示某人正在做某事