We (are obliged to) grow up in skepticism, requiring proofs for every assertion about nature, (but) there is no way out (except

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问题 We (are obliged to) grow up in skepticism, requiring proofs for every assertion about nature, (but) there is no way out (except to) move ahead and plug away, hoping for comprehension in the future (but) living in a condition of intellectual instabilit

选项 A、are obliged to
B、but
C、except to
D、but