单项选择题

The booksellers didn't want to buy all the books, ().

A. did he
B. didn't they
C. do they
D. did they

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单项选择题
The mother gave the baby a toy () in order that she could do her washing.

A. to play
B. to play with
C. to be played
D. to be played with
单项选择题
Not once in these years () the prices of these products.

A. we changed
B. have we changed
C. did we change
D. we have changed
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