单项选择题

Henry Ford’s introduction of the assembly line vastly reduced the time it took ______a car.

A. in making


B. for making
C. on making


D. to make
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单项选择题
Many a man ______ life is meaningless without purpose.
A. think
B. thinks
C. thought
D. has thought
单项选择题
She ought to stop work; she has a headache because she ______ too long.
A. has been reading

B. is reading
C. had read



D. read
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