摘要： 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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