what is a prefix?

A   A word within a word

B   A group of letters put before a root word which changes its meaning

C   A group of letters put at the end of a root word which changes its meaning

D   A group of letters put at the end of a sentence which changes its meaning

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19. To beg the question_____?

A.   to refer to B.   to take for granted C.   to raise objections D.   to …