问题
选择题
I don't know _____ my sister loves the MP3 _____ not. [ ]
A. if; but
B. whether; not
C. as; or
D. whether; or
答案
答案：D
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I don't know _____ my sister loves the MP3 _____ not. [ ]
A. if; but
B. whether; not
C. as; or
D. whether; or
答案：D