问题
选择题
It's helpful _____ you to give me _____ useful advice. [ ]
A. for; so
B. of; such a
C. of; such
D. for; so a
答案
答案：C
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It's helpful _____ you to give me _____ useful advice. [ ]
A. for; so
B. of; such a
C. of; such
D. for; so a
答案：C