问题
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
B:comes to
C:happens to
D:speaks to
正确答案是：
同类题型
What surprised me most was _________ to meet hisgirlfriend again.
If he ______ my advice, he wouldn’t have lost his job.
What do you think of my article, professor—The former part is well written but _____ is just so so.
Mrs Brown gave birth________ a boy ________ May 2nd.
If __________ bicycle is broken, _________ can use __________.