Most of the changes (occurred) in pattens of family planning (had taken place) before public family services were established an

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问题 Most of the changes (occurred) in pattens of family planning (had taken place) before public family services were established and at (considerable) emotional and physical costs (to many couples).

选项 A、occurred
B、had taken place
C、considerable
D、to many couples

答案A

解析
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