题目内容

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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