We did not discover that his apprehension concerning our hypothesis was______until well afterward, following a series of rigorou

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问题 We did not discover that his apprehension concerning our hypothesis was______until well afterward, following a series of rigorous trials and revisions, at which point our experiment proved an unqualified success.

选项 A、unfounded
B、alert
C、tenuous
D、logical
E、peremptory