( )The little girl_____TV all day.She did nothing.A.keeps watching B.kept to watching C.keeps to
问题描述：
( )The little girl_____TV all day.She did nothing.A.keeps watching B.kept to watching C.keeps to
watch D.kept watching The number of students in our school____(is,are)4000and a number of them ___(is,are)good at playing ping pong.
答
1.D
keep doing sth.持续做某事
而后面一句用的是一般过去时 did,所以keep 用过去式：kept
2.is； are
the number of ...的数量,用单数
a number of 很多,用复数