______percentage of working women in the United States has doubled since 1940 has been the result of both economic and social fa

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问题 ______percentage of working women in the United States has doubled since 1940 has been the result of both economic and social factors.

选项 A、The
B、That the
C、There is the
D、It is the

答案B

解析 That引导主语从句作“has been the result”的主语。percentage需有定冠词修饰。
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