_______ Great Wall is one of the seven wonders around the world.
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—Mum, I'm going on a picnic with my friends today.—Have _______ good day.
A. a
B. A
C. an
D. /
One of his daughters became _______ English teacher last August.
A. a
B. an
C. the
D. /
Lucy is _____11-year-old girl. She is good at playing _____guitar.
A. / ; a
B. an ; /
C. an ; the
D. a ; an
传动轴弯曲或传动轴管凹陷都会引起传动轴动不平衡。
A. 对
B. 错