Hearing loss in a large number of teenagers______ caused because of their listening to loud music.
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A
is
B
has
C
are
D
have
推荐题目
 The club, _____ 25 years ago, is holding a party for past and present members.
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A
founding
B
founded
C
being found
D
to have found
Mr. Li devoted all his life         English. Now he retired.
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A
to teach
B
to teaching
C
to be taught
D
to have being taught
The experiment shows that proper amounts of exercise, if  __  regularly, can improve our health.
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A
being carried out
B
carrying out
C
carried out
D
to carry out