Only an hour ago ________ out why he was absent.
A．did the teacher foundB．the teacher found
C．did the teacher find D．had the teacher found
C

試題分析：句意，只是在一小時(shí)之前，老師才知道了他缺席的原因。當(dāng)only+狀語位于句首時(shí)，句子要用部分倒裝。所謂部分倒裝就是把謂語動(dòng)詞的一部分，即助動(dòng)詞、情態(tài)動(dòng)詞、系動(dòng)詞移至主語的前面。因?yàn)榍懊嬗辛酥鷦?dòng)詞或情態(tài)動(dòng)詞，所以后邊的動(dòng)詞要用原形，故選C。
點(diǎn)評(píng)：英語句子中，當(dāng)only所修飾的副詞、介詞短語或狀語從句放在句首時(shí)，句子要用部分倒裝。
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