单项选择题

The （） problem of bringing a space-ship back from the moon has been solved.

A.technique 
B. technology  
C. technical  
D. technological

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单项选择题
Tom's brother speaks French very well （）Tom can speak little French.

A. or      
B. unless     
C. in spite of    
D. while
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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