7．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 【查看更多】

 

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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

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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

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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

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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

 

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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

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