单项选择题

He set up in business ______ his own and was very successful.

A. in
B. of
C. on
D. by

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单项选择题It was not the first time he ______ . I think it’s high time we ______ to take him seriously.

单项选择题Although I liked the appearance of the house, what really made me decide to buy it was the beautiful ______ through the window.