Questions and exercises are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.
A.
either, or
B.
both, and .
C.
whether, or
D.
not only, but also
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举一反三
【单选题】Homophones are often employed to create puns for desired effects of ______.
【单选题】As homonyms are identical in sound or spelling, particularly ______, they are often employed in a conversation to create puns for desired effect of humor, sarcasm or ridicule.