问题
选择题
Mary made a few changes to the design and made her own needle, _____ saving people a lot of time.
A．one
B．she
C．that
D．it
答案
答案：A
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Mary made a few changes to the design and made her own needle, _____ saving people a lot of time.
A．one
B．she
C．that
D．it
答案：A