问题
选择题
As far as I know, shopping online has many advantages, _____ the most important one is convenience.[ ]
A. during which
B. of them
C. of which
D. of whom
答案
答案：C
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As far as I know, shopping online has many advantages, _____ the most important one is convenience.[ ]
A. during which
B. of them
C. of which
D. of whom
答案：C