The discovery was made_______, which we hadn’t expected .
A．on purposeB．a(chǎn)t presentC．in advanceD．by accident
D
on purpose故意的；at present現(xiàn)在的，目前的；in advance提前；by accident偶然的。根據(jù)which we hadn’t expected，我們沒(méi)想到會(huì)有這個(gè)發(fā)現(xiàn)，所以應(yīng)是偶然發(fā)現(xiàn)的。選D。
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