摘要：31．When it air pollution, Beijing faces the three “C s, cars, coal and construction, which lead to Beijing’s thick air pollution. A．refers to B．comes to C．happens to D．speaks to
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When it ________ air pollution, Beijing faces the three“C”s-cars, coal and construction, which lead to Beijing's thick air pollution．
- A.refers to
- B.comes to
- C.happens to
- D.speaks to
When it ________ air pollution, Beijing faces the three“C”s, cars, coal and construction, which lead to Beijing's thick air pollution．
[ ]
A．refers to
B．comes to
C．happens to
D．speaks to
When it______ air pollution, Beijing faces the three “C” s-----cars，coal and construction，which lead to Beijing's thick air pollution.
A. refers to B. comes to C. happens to D. speaks to
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