单项选择题

I know the difference between these two words.So（）they.

A.know
B.will
C.do
D.does

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Ⅰ. Phonetics (5 points)Directions: In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the answer sheet.1. A. question B. notion C. exception D. vocation
单项选择题
21.（）

A.effects
B.defects
C.infects
D.affects
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