单项选择题

The teacher with a number of students（）in the classroom.

A. are
B. are talking
C. stay
D. is

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单项选择题
So little （）about mathematics that the lecture was completely beyond me

A. I know    
B. I knew     
C. did I know  
D. do I know
单项选择题
Some of them（） here for three days.

A. have arrived
B. have got
C. have reached
D. have been
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