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The discovery was made_______, which we hadn’t expected .
A.on purposeB.at presentC.in advanceD.by accident
D
on purpose故意的;at present现在的,目前的;in advance提前;by accident偶然的。根据which we hadn’t expected,我们没想到会有这个发现,所以应是偶然发现的。选D。
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