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题目内容
（甘肃中医药-大学英语（专升本））
8. (单选题) It took me some time to ______ what was causing this.(本题5.0分)
A、 work out
B、 work with
C、 work in
D、 work at
A、 work out
B、 work with
C、 work in
D、 work at
参考答案
