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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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