问题
选择题
Plastic bags are provided for our convenience but they have also_______ the pollution of the environment．
A．adapted to
B．turned to
C．contributed to
D．looked forwarded to
答案
答案：C
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Plastic bags are provided for our convenience but they have also_______ the pollution of the environment．
A．adapted to
B．turned to
C．contributed to
D．looked forwarded to
答案：C