A、  B、  C、  D、  Bconcentrate on意为“集中,专心于”,document意为“文件”。

admin2012-04-04  15

问题
(A)They’re setting the table for a meal.
(B) They’re concentrating on some documents.
(C) They’re taking off their glasses.
(D)They’re taking their seats for a meeting.

选项 A、 
B、 
C、 
D、 

答案B

解析 concentrate on意为“集中,专心于”,document意为“文件”。
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