Air pollution, together with littering, ____ many problems in our large industrial cities today.
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A
causes
B
cause
C
caused
D
causing
推荐题目
Jack became seriously ill after ________ in polluted air for many years.
#89778
A
breathed
B
breath
C
breathing
D
to breathe
The Diaoyu Islands have been part of China’s territory since ancient times, __________ as important fishing grounds of Taiwan.
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A
served
B
to serve
C
serving
D
having served
Did you have trouble ________the post office?
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A
to have found
B
with finding
C
find
D
in finding
Johnson, to grasp the chance to become a doctor, decided to take up teaching.
#90720
A
fails
B
failed
C
to fail
D
having failed