问题
选择题
_____ is impossible _____one to do two things at one time. [ ]
A. It; of
B. It; for
C. That; of
D. This; for
答案
答案：B
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_____ is impossible _____one to do two things at one time. [ ]
A. It; of
B. It; for
C. That; of
D. This; for
答案：B