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问题: Columbus _______ prove that India could be reache

In those days, the Portuguese (葡萄牙人) were trying to reach India by sailing round Africa, but Columbus _______ prove that India could be reached by sailing west.
A. was determined in
B. determined
C. was determined to
D. determined in

解答:

很明显是C。be determined to do sth,决心做某事。A和D明显不对的原因是: in 是借此,后面的动词prove要用动名词形式。