The concern (has been) that the embryo bank (might be) exploited (by unscrupulous), or that conception might precede birth by ni

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问题 The concern (has been) that the embryo bank (might be) exploited (by unscrupulous), or that conception might precede birth by nine or even ninety years, (rather than) by nine months.

选项 A、has been
B、might be
C、by unscrupulous
D、rather than

答案C

解析
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