题文
你想知道Mike今天下午是否有空，你会问：
A. How are you, Mike?
B. What are you doing, Mike?
C. Are you free this afternoon, Mike?
你想知道Mike今天下午是否有空，你会问：
A. How are you, Mike?
B. What are you doing, Mike?
C. Are you free this afternoon, Mike?
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