题目内容
（请给出正确答案）
A、being tied to the clock, but not to the inputs. 受时钟控制，跟输入无关。
B、having full control over the FF, regardless of the input or clock states. 不管输入或时钟状态如何，完全能够决定触发器状态。
C、being tied to the inputs, but independent of the clock. 受输入控制，独立于时钟。
D、having little or no control over the FF, except during the active clock input. 除了时钟输入有效时，对触发器几乎或完全没有影响。
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