受精卵经3～4天的细胞反复分裂成桑椹胚而进入宫腔，在什么条件下适合着床

A．受精后7～8天囊胚期，子宫内膜处于分泌晚期
B．子宫内膜出现明显的蜕膜反应
C．排卵后5～6天的子宫内膜
D．受精卵的透明带尚存在时
E．子宫内膜分泌期，着床在致密层

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

8（）

A.whether

B.how

C.what

D.why