We shall probably never be able to______the exact nature of these sub-atomic particles.

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问题 We shall probably never be able to______the exact nature of these sub-atomic particles.

选项 A、assert
B、impart
C、ascertain
D、notify

答案C

解析 本题中assert“断言,声称”;impart“传授,告知,透露”;ascertain“确定,查明,弄清”;notify“通知,告知,报告”。本题考查和nature搭配的动词,只有C符合要求。
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