It was as a result of my dream ______ I began to explore a secret ambition I'd had ______ I was a child, to bee a writer.A.which; whenB.in which; asC.as; whenD.that; since
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D解析本句还可说成：I began to explore a secret ambition as a result of my dream and I had had the secret ambition to bee a writer since I was a child.由此可看出前一个空考查强调句型；I'd had为定语从句。根据句意，第二个空应填since。