单项选择题

The workers requested that their working conditions ______.

A. must be improved
B. be improved
C. would be improved
D. were improved
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单项选择题
I don't think Jim saw me. He ______ into space.
A. just stared
B. has just stared
C. had just stared
D. was just staring
单项选择题
Has this volume been a good ______ for your money
A. cost
B. worth
C. price
D. value
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