单项选择题
My father seldom let me do that, ______.
A．did he
B．did not he
C．does he
D．does not he
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单项选择题
Not until 1959 ______ this compound.
A．that chemists succeeded in obtaining
B．did chemists succeed to obtain
C．chemists succeeded in obtaining
D．did chemists succeed in obtaining
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单项选择题
As they searched the room, they looked for ______ to the crime.
A．labels
B．scenes
C．clues
D．tags
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