Question

【题目】Seeing their teacher __________ into the classroom, they stopped __________ at once.
A.walk; telling
B.entering; to speak
C.enter; to tell
D.walking, talking

Answer 1

【答案】D
【解析】see somebody doing something看见某人正做某事，stop doing something停止做某事。根据句意：看到他们的老师走进教室，他们立刻停止说话。故选D。