单项选择题
() was Goodyear, an American scientist, who invented that kind of robot.
A. Who
B. He
C. It
D. This
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单项选择题
Three fourths of the research () next year.
A. begin
B. begun
C. began
D. begins
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单项选择题
The number of the people present, as we had expected, () very large.
A. was
B. were
C. is
D. are
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