摘要：35．Air pollution, together with littering, many problems in our large industrial cities today． A．causes B．cause C．caused D．causing
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Air pollution, together with littering, __________ many problems in our large industrial cities today．
[ ]
A．causes
B．cause
C．caused
D．causing
Air pollution, together with littering, ____ many problems in our large industrial cities today.
| A．causes | B．cause | C．caused | D．causing |
Air pollution, together with littering, ____ many problems in our large industrial cities today.
|
A．causes |
B．cause |
C．caused |
D．causing |
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