单项选择题

The new bill will come into ______ on the day it is passed.

A. effect
B. use
C. service
D. existence
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单项选择题
Ⅰ PhoneticsDirections: 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.
A. neighbor
B. laugh
C. tough
D. cough
单项选择题
21（）

A．which
B．that
C．all
D．those
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