问题描述：
the population of the united states is about 295 million,that of china ,
the population of the united states is about 295 million,_____ that of china ,almost the same size as america,is 1.3 billion.
a.as b.when c.while d.since
the population of the united states is about 295 million,_____ that of china ,almost the same size as america,is 1.3 billion.
a.as b.when c.while d.since
问题解答：
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