I want to know all negative effects the Internet           our lives.
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A
has in
B
have in
C
has on
D
have on
推荐题目
Four-fifths of the crop ______. 
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A
are ruined
B
was ruined
C
were ruined
D
have been ruined
_____ has been introduced to the students to help them make progress.
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A
Many books as well as advice
B
Some advice as well as many books
C
Not only some advice but also many books
D
Some advice and many books
 Every possible means ______ to prevent the air pollution, but the sky is still not clear. 
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A
has been used 
B
have been used
C
is used 
D
are used