单项选择题

He ______ at the steel plant since 1949.

A. was working
B. worked
C. has been working
D. work
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单项选择题
She's ______ as her mother.
A. as a good cook
B. a good cook as
C. as good a cook
D. a as good cook
单项选择题
The girl ______ was the best in the class was given a prize.
A. which work
B. whose work
C. what work
D. that work
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