单项选择题

They took ______ measures to prevent poisonous gases from escaping.

A. fruitful
B. beneficial
C. sufficient
D. effective
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单项选择题
To get information related to your study, you’d better pay close attention to ______ .
A. newspapers and magazines
B. the problems and solutions
C. all the areas of your study
D. the suggestions of the teachers
填空题
Why is it possible to deal with all the exercises during class hours _____________________________________. Because there is not_____________________________.
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