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We shall probably never be able to（ ）the exact nature of these sub‐atomic particles.
A.assert
B.impart
C.ascertain
D.notify
B.impart
C.ascertain
D.notify
参考答案
参考解析
解析：句意：也许我们将永远无法查明这些亚原子粒子的确切性质了。ascertain意为“确实（事实），探知，查明”，符合题意。A.assert指“断言；坚持”，B.impart意为“传播（知识等），告知（情报）”，［D］notify指“通知，报告”。
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