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【多选题】
同一个卖家多次发生成交不卖行为属于XX违规，要收到XX黄牌?A.
严重;6张
B.
一般;1张
C.
严重;12张
D.
一般;2张
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举一反三
【简答题】A．The late seenth century. B．The early eighth century. C．The late nineth century. D．The early twentieth century.
【单选题】the exploration of the botanical world on a large scale.
A.
It was not until the eighteenth and nineteenth centuries that; had begun
B.
It was not until the eighteenth and nineteenth centuries when; began
C.
Not until the eighteenth and nineteenth centuries did; begin
D.
Until the eighteenth and nineteenth centuries; began
【单选题】The eighteenth and nineteenth centuries _____ the widespread use of electricity and the birth of the steam engine , leading to the development of factories and cities.
A.
watched
B.
observed
C.
saw
D.
showed
【简答题】活塞顶部类型有__、__和__三类。
【单选题】Bill is ________. [ ]
A.
eighteen years old
B.
eighteen year old
C.
eighteenth years old
D.
eighteenth years old
【简答题】元件的类型有: 、 按钮和影片剪辑。
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