单项选择题
It was 12 o'clock ______the plane took off.
A．when
B．that
C．since
D．till
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单项选择题
Not until______ the whole thing to him ______that he was wrong.
A．had I explained, he realized
B．had I explained, that he realized
C．I had explained, that he realized
D．I had explained, did he realize
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单项选择题
—What made her so upset —______the necklace ______yesterday.
A．Lost, bought
B．Lost, buying
C．Losing, having bought
D．Losing, bought
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