题目内容
Mozart wrote his first opera ________ the age of 12.
[ ]
A.in
B.on
C.at
D.for
答案:C
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( ) 2. Mozart wrote music when he was a child.
( ) 3. Arran is not a talented child.
( ) 4. Mozart passed the British Junior High School exam when he was five.
( ) 5. Ruth Lawrence entered university when she was twelve.
( ) 6. Bobby Fischer studied math at university in his teens.