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【简答题】
初级卵母细胞是由胚胎期的（）分化而来，并长期停滞在第（）次减数分裂的（）。
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反馈参考答案：
举一反三
【单选题】Last Sunday,when I got to the station,I I had left my ticket at home.
A.
understood
B.
realized
C.
believed
D.
seemed
【简答题】I got to the station, only (find) ______ that the train was pulling out.
【单选题】When I got to the station the train ______.
A.
left
B.
has left
C.
had left
D.
have left
【单选题】When I got to the station the train ______ left.
A.
already had
B.
had already
C.
has already
D.
already has
参考解析：
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