单项选择题

The new regulations will ______ into force on October 1 next year.

A. come
B. become
C. bring
D. begin
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The researchers have come up with numerous explanations to ______ their failures.
A. excuse
B. justify
C. admit
D. avoid
单项选择题
The winter was ______ cold, causing great hardship to the poorer people in this are
a.A. exceptionallyB. explosivelyC. extensivelyD. expressively
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