GRE考试

【单选题】How any fetus survives gestation has baffled scientists for decades: the embryo’s tissues are half foreign and yet, unlike______organ transplant, it isn’t normally rejecteD、
A、an adaptive
B、a mismatched
C、a successful
D、an obdurate
E、a preplanned
网考网参考答案：B
网考网解析：
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