单项选择题

It is said in the book that Thomas Edison(1847～1931)（）the world leading inventor for sixty years.

A. would be
B. has been
C. had been
D. was

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单项选择题
Mrs. White has a hard time because she has six children（）

A. look after
B. to be looked after
C. to look after
D. looking after
单项选择题
She would rather have a room（）than sleep with her sister.

A. on her own
B. of her own
C. of hers
D. for her
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