人受一般心理过程支配，消费活动存在着共同的特征（）
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We _________ the lessons _________ of last month.
A. finished, in the end
B. had finished, to the end
C. had finished, by the end
D. will finish, at the end
You should try to write __________ eve n when you ’ re busy. As you know, practice makes perfect.
A. now and then
B. more or less
C. sooner or later
D. here and there
目前常用的网络传输介质有：双绞线、同轴电缆、光纤和无线信道（）
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