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來源：網絡來源 作者：中考網編輯 2021-03-24 14:20:27
中考網整理了關于2021中考英語過去完成時專項練習題（五），希望對同學們有所幫助，僅供參考。
Catherine ______ the letter before her mother came into her bedroom.
A. had written
B. was written
C. has written
D. is writing
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