选择题："May I speak to your manager Mr. Williams at five o′clock tonight?" "I′m sorry.

题目内容：

"May I speak to your manager Mr. Williams at five o′clock tonight?"

"I′m sorry. Mr. Williams ___________ to a conference long before then."

A.have gone

B.would have gone

C.had gone

D.will have gone

参考答案：

答案解析：

Silver is the best conductor of electricity, copper ___________ it closely.

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学生在学习正方形的过程中，知道正方形有四个直角和四条相连接的边的关键特征，不论它多大，是什么颜色的，只要符合这关键特征的都可以被认为是正方形。这属于奥苏贝尔提出的有意义学习当中的( )。

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Do you have any idea what you would like to be and do after graduation? A lot of people don′! begin

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