Only when 1 was fourteen__________the importance of study．
A．I realizedB．did I realizeC．had I realizedD．I had realized

B

句意：只有當(dāng)我14歲時，我才意識到學(xué)習(xí)的重要性。Only修飾狀語when位于句首時需使用部分倒裝，本句的時態(tài)應(yīng)使用一般過去式。
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