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【单选题】
正常植入条件中，下列哪项错误A.
母体性激素正常分泌
B.
子宫内膜处于增生期
C.
受精卵必须发育至胚泡
D.
胚泡必须准时到达子宫腔
E.
透明带准时消失
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反馈参考答案：
举一反三
【单选题】People always shake hands with each other when ___.
A.
to introduce
B.
introduce
C.
introduced
D.
introducing
【简答题】单刀的效果是
【简答题】People always shake hands with each
other when _____.A. introducing B. introduced C. to introduce D. introduce
【单选题】People always _____________ when say hello and goodbye in South Korean.
A.
bow from the waist and lower the eyes
B.
shake hands
C.
make eye contact
D.
touch nose
【单选题】People always shake hands and say 'How do you do?' when______to each other.
A.
introduced
B.
introducing
C.
introduce
D.
to be introducing
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