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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
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推荐题目
Four-fifths of the crop ______. 
#85690
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
Kate with her parents often __________ to a movie on weekends.
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A
go
B
goes
C
going
D
to go
 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
. My suggestion is that Tom ______________ there on time.
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A
is
B
be
C
will be
D
has been