问题
选择题
I don't know ______ snooker (斯诺克台球) is popular among teenagers in your country. [ ]
A. that
B. what
C. whether
D. where
答案
答案：C
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I don't know ______ snooker (斯诺克台球) is popular among teenagers in your country. [ ]
A. that
B. what
C. whether
D. where
答案：C