单项选择题

No matter how frequently ______, the works of Beethoven always attract large audiences.

A. performing


B. performed
C. to be performed


D. being performed
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单项选择题
Jean Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it ______ in a religious, as well as worldly, frame of reference.
A. is to be analyzed


B. were analyzed
C. be analyzed


D. should have been analyzed
单项选择题
The scientist has made another wonderful discovery, ______ is of great importance to science.
A. which I think


B. which I think it
C. of which I think


D. I think which
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