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20、Before you put forward an argument, you should collect facts ________ your viewpoint.

A. which to base on                       B. with which to support

C. with which to base                       D. which to support on

20、B

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Before you put forward an argument, you should collect facts ________ your viewpoint.

A. which to base on                       B. with which to support

C. with which to base                       D. which to support on

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