Last thursday I noticed some parents ___ at the back of the classroom an ___ to the teacher

问题描述:

Last thursday I noticed some parents ___ at the back of the classroom an ___ to the teacher
A. sitting ;listened
C.sitting;listening
--Let's go to see the dolpgins.
--Great ! I like watching them ___ and swim.
A.jumpB to jump
C jumping D jumped

C
notice sb doing ,如果是seat,则用seated,
A
watch sb doing /do
后面是swim,则前面还用原形