题目内容

The idea that the earth is flat was _______ centuries ago.

A. appointed
B. rejected
C. hesitated
D. measured

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Her mistakes ______ the death of the patient.

A. led to
B. brought about
C. broke off
D. resulted from

If I ____ you, I would do it at once.

A. was
B. should
C. were
D. am

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