单选题
Mr. Smith can be quite sad ______ , though in public he is extremely cheerful.
A、
by himself
B、
in person
C、
in private
D、
as individual
【正确答案】
C
【答案解析】
[注释] A选项意思为“独自”；B选项意思为“亲自”；C选项意思为“私下”；D选项意思为“作为个人”。只有C选项与后半句的in public(在公开场合)在意思上相对应，所以C为正确答案。
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