皮皮学，免费搜题
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【单选题】
继发性闭经最常见的原因是下列哪项A.
下丘脑性闭经
B.
卵巢性闭经
C.
垂体性闭经
D.
子宫性闭经
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】---You should ______ to her for what you did _____her the other day. ---Why should I? It was not my fault. [ ]
A.
apologize; to;
B.
have apologized; to;
C.
apologize; with;
D.
have apologized; about
【单选题】There is no reason why you should tell them ______ that you are going.
A.
for advance
B.
in advance
C.
on advance
D.
of advancing
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