Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.
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A
being used
B
used
C
to be used
D
having been used
推荐题目
It will really make no difference ________ he doesn’t come tonight.
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A
if
B
whether
C
that
D
what
Information has been put forward ________ more middle school graduates will be admitted into universities.
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A
while
B
that
C
when
D
as
As a coach, you should know clearly about the direction _____ your team should develop.
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A
to which
B
from which
C
in which
D
for which