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This problem is quite difficult. Please ________ it ________.

[　　]

A．think; about
B．think; over
C．think; of
D．think; up

答案：B
提示：

提示：think of“認(rèn)為，想起”，think about“考慮”，think over“仔細(xì)考慮”think up“想出”，由句意可知應(yīng)選B。


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