Now most families have only one child our country’s one-child policy. A. since B. because

Now most families have only one child our country’s one-child policy.
A. since B. because C. because of

解析：since由于，自从……以来；because因为；because of因为。句意：因为我国的一孩政策，现在许多家庭只有一个孩子。Because和because of都表示原因，区别是前者接从句，后者接名词性短语。下文our country’s one-child policy为名词性短语，故选C.

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