Section1上期复习The workers were glad to hear that their new pay increases were retroactive to the beginning of the previous month. (从过去的某个时间开始起)生效。 Section2The experts were hired to enhance the computer system so that it could prepare additional types of reports. (Hint: Could the computer already do everything needed?) 请选择true or false: 1．T/ F 　The computer system was removed and a new one installed.   2．T/ F 　The original computer system did not do everything the company wanted it to do.   答案： 1．F　　　 2．T

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