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【单选题】
差分放大电路的作用是()A.
放大差模信号，抑制共模信号
B.
放大共模信号，抑制差模信号
C.
放大差模信号和共模信号
D.
抑制差模信号和共模信号
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【简答题】请写出“此曲只应天上有”下一句?
【单选题】No sooner that than he regretted.
A.
he says
B.
does he say
C.
he had said
D.
had he said
【单选题】As we all know, he has regretted wasting the precious time______ he should have studied hard playing computer games at school.
A.
where
B.
that
C.
on which
D.
when
【简答题】填入适当的前置词: Hay libros y revistas ______ la mesa. ¿______ quién son?
【单选题】He ______ in London for more than ten years, but he has never regretted his final decision to move back to China.
A.
has lived
B.
was living
C.
lived
D.
would live
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