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【判断题】
主从 JK 触发器在 CP=1 期间,存在一次性变化。 ( )A.
正确
B.
错误
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举一反三
【单选题】I won’t watch the TV play if my father ________ me do my homework. [ ]
A.
let
B.
will let
C.
won’t let
D.
lets
【单选题】If my father here last night, he me from going.
A.
had been;would have prevented
B.
had been;would prevent
C.
were;would
D.
were;would have prevented
【单选题】If my father ______ here yesterday, he would have stopped me from going surfing.
A.
had been
B.
were
C.
should be
D.
has been
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