Harold Palmer and A. S. Hornby, two pioneers of the Oral Approach, were familiar but dissatisfied with the___________

Harold Palmer and A. S. Hornby, two pioneers of the Oral Approach, were familiar but dissatisfied with the____________ Method/Approach.

Harold Palmer and A. S. Hornby, two pioneers of the Oral Approach, were familiar but dissatisfied with the____________ Method/Approach.
【正确答案】：Direct

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