单选题：W: What' s up with Donald? I've never seen him so happy.____

题目内容：
W: What' s up with Donald? I've never seen him so happy.________ A．The weather is fine. Maybe he' s suffering from cold.
B．His supervisor gave performance evaluation this morning.
C．Perhaps he was reading some novels.
D．That' s beyond me. I can' t guess what was happening with Donald.
参考答案：
答案解析：

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