卵子自卵巢排出后未受精，黄体开始萎缩是在排卵后的
A．4～5天B．9～10天C．11～12天D．13～14天E．15～16天
参考答案：B
The famous star got injured before her concert, made her fans worried.
A．who
B．which
C．that
D．what
I was writing in my room （） a ball broke window.
A．when
B．as
C．where
D．while
