She read the letter through before sending it, for spelling mistakes. A. checked B. to be——青夏教育精英家教网—

摘要： She read the letter through before sending it, for spelling mistakes. A. checked B. to be checking C. checking D. having checked

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She read the letter through before sending it, ______ for spelling mistakes.

A. checked B. to be checking C. checking D. having checked

She read the letter through before sending it, ______ for spelling mistakes.

A. checked B. to be checking C. checking D. having checked

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