問題補充：
單選題
She is said _____in the United States for four years before she came back to work in our company.A.to studyB.to be studyingC.to have studiedD.studying
網(wǎng)友答案：
熱心網(wǎng)友 1樓
C解析常用句型 sth/sb is said to do ....據(jù)說。。。題中出現(xiàn)了for four years 說明要用完成時。
