Only when Jim was away from home _______
题型：选择题
问题：
Only when Jim was away from home _______ how nice his family was.
A．did he realize
B．he realized
C．has he realized
D．he has realized
题型：选择题
下图是排卵、受精、受精卵发育、植入子宫内膜的连续过程，试回答下列问题。
(1)产生卵细胞和分泌雌性激素的是标号[ ]___________。
(2)精子和卵细胞结合的场所是标号[ ]。
(3)胚胎发育的场所是标号[ ]_________。