106. The method highly effective.A. was provedB. proved asC. proved to beD. is proved to

发布时间：2020-08-16 07:09:00


106. The method      highly effective.
A. was proved
B. proved as
C. proved to be
D. is proved to be

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A. was proved
B. proved as
C. proved to be
D. is proved to be
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