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These are terms used in digital electronics to designate the

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These are terms used in digital electronics to designate the basic logical operations ____ digital systems are founded.
A. of which B. on which C. in which D. at which
Why B?
e founded on (the operations)建立在……的 基础上
补充下,这个是倒装句,原句是
These are terms used in digital electronics to designate the basic logical operations on which digital systems are founded.
所以可以写成:
Digital systems are founded on these terms that used in digital electronics to designate the basic logical operations.