While listening in class, you should concentrate ________ your teacher.

[　　]

A. on
B. to
C. for
D. at

答案：A
提示：

短語(yǔ)concentrate on意為“集中注意力到……”


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【小題2】The underlined phrase On the contrary  means _________ .
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area   because    help    means   its     during      better
answer   new
     
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8.A. its            B. his                 C. her             D. their

9.A. achieve       B. make               C. do              D. give

10.A. by          B. for                 C. with             D. from

 

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