19、______ more experiments and you will be able to clarify the procedure ______ they communicate information．

A．Design; in which                                        B．Designing; by which

C．Design; by which                                       D．Designing; in which

19、C

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______ more experiments and you will be able to clarify the procedure ______ they communicate information．

A．Design; in which                                        B．Designing; by which

C．Design; by which                                       D．Designing; in which

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