单项选择题

Dr. Johnson is head of the department, ______ an expert in translation.

A. or
B. either
C. but
D. and
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单项选择题
The team has been working overtime on the research project ______.
A. lately
B. just now
C. late
D. long ago
单项选择题
The police had difficulty in ______ the fans from rushing on to the stage to take photos with the singer.
A. limiting
B. restraining
C. confining
D. restricting
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