用括号内单词的正确形式填空。
1．[2015·浙江温州一模]Mary wrote a letter to her parents, ________ (say) she missed them and was studying hard.
答案：saying 考查非谓语作状语。其逻辑主语是Mary，两者为主动关系，且“say”与“wrote”同时发生，故用现在分词。
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