填空题


【参考答案】

在know和had之间加it。
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填空题
在smith和a之间加for。
单项选择题
A.make every effort to prevent mistakesB.find the best sources of informationC.maintain a positive attitude at all timesD.take risks
A.make every effort to prevent mistakes
B.find the best sources of information
C.maintain a positive attitude at all times
D.take risks
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