单项选择题

The method of painting is known as ______ far back as the Song Dynasty.

A. to be used
B. to have used
C. to have been using
D. to have been used
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单项选择题
The young man who has appiled for the post ______ in the general manager’s office.
A. is interviewing
B. is being interviewed
C. to be interviewed
D. had been interviewed
单项选择题
Great as Newton was, many of his principles ______ and modified by contemporary scientists today.
A. are to challenge
B. may be challenged
C. are challenging
D. have been challenged
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