18 The secretary worked late into the night, ___ a long .18 The secretary worked late into the night, ___ a long speech for the manager. 为什么用preparing 不用was preparing

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18 The secretary worked late into the night, ___ a long .18 The secretary worked late into the night, ___ a long speech for the manager. 为什么用preparing 不用was preparing
18 The secretary worked late into the night, ___ a long .
18 The secretary worked late into the night, ___ a long speech for the manager. 为什么用preparing 不用was preparing

18 The secretary worked late into the night, ___ a long .18 The secretary worked late into the night, ___ a long speech for the manager. 为什么用preparing 不用was preparing
用preparing作状语
要是用was preparing,前面的逗号应该去掉,加上and,句子就正确了