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

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

Last thursday I noticed some parents ___ at the back of the classroom an ___ to the teacher A. sitting ;listenedC.sitting;listening--Let's go to see the dolpgins.--Great ! I like watching them ___ and swim.A.jump B to jumpC 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

1. C (notice...doing...注意到……正在……)
2. A (watch...do...观看……做……,后面还有and swim提示)