单项选择题

The man was under so much stress for such a long time that he finally ______.

A．broke down
B．broke up
C．broke out
D．broke in
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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
She was too nervous to act ______ on such an occasion.
A．originally
B．specially
C．extraordinary
D．naturally
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