问题
选择题
It's _____ me a lot of time to find out what I really want to do in the future. [ ]
A. paying
B. spending
C. taking
D. using
答案
答案：C
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It's _____ me a lot of time to find out what I really want to do in the future. [ ]
A. paying
B. spending
C. taking
D. using
答案：C
下降，PaCO2正常的是().