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【参考答案】

在know和had之间加it。
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A．it is important in business to make a strong impressionB．image and ability are equally importantC．most business people are too serious and traditionalD．his business ideas are more important than his appearance
A．it is important in business to make a strong impression
B．image and ability are equally important
C．most business people are too serious and traditional
D．his business ideas are more important than his appearance
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