单项选择题

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

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单项选择题

______ , Mozart had already written his first composition.

A．His age was six
B．By the age of six
C．He was six
D．Six years old

单项选择题

Only through diplomatic means ______.

A．a formal agreement can be reached
B．can a formal agreement be reached
C．can be a formal agreement reached
D．can be reached a formal agreement

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