问题
选择题
I often have the case ______ I can't recognize my friends' voice on the phone.[ ]
A. which
B. that
C. of which
D. where
答案
答案：D
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I often have the case ______ I can't recognize my friends' voice on the phone.[ ]
A. which
B. that
C. of which
D. where
答案：D