单项选择题

Up to now scientists have not found how to（）patients of that disease.

A. cure
B. treat
C. deal with
D. get rid of

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单项选择题
He doesn't know （）or go home.

A. to wait
B. if to wait
C. if that he should wait
D. whether he should wait
单项选择题
This book costs （）that one.

A. twice more
B. twice more as
C. two times more as
D. twice as much as
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