It was only after I came across that matter_______ how important it was to master a foreign languageA.did I realizeB.had I realizedC.that I realizedD.when I realized
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C解析考查it was…that…的强调句型。去掉it was…that后，剩下I realized how important it was to master a foreign language only after I came across that matter，是一个完整句子，所以是强调句型。选C。