单项选择题

Corn originated in the New World and thus was not known in Europe until Columbus found it ______ in Cuba.

A. being cultivated

B. having cultivated
C. been cultivated


D. cultivating
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单项选择题
Criticism and self-criticism is necessary ______ it helps us find and correct our mistakes.
A. by that
B. at that
C. on that
D. in that
单项选择题
They are teachers and don’t realize ______ to start and run a company.
A. what it takes


B. what takes it
C. what they take


D. what takes them
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