单项选择题

All ______ is an adequate supply to meet the demand.（）

A. needed
B. the things needed
C. that needed
D. what is needed

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单项选择题
Though I haven't seen him for years, I can ______ his voice on the telephone.（）

A. realize
B. discover
C. accept
D. recognize
单项选择题
No culture exists in（） . It all comes from someplace. Ancient customs were modern one time.

A. vacuum
B. emptiness
C. blank
D. space
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