问题
单项选择题
After several days of heavy rain the roof（）with a loud noise, crashing (坠落) onto the ground.
A.came out
B.came down
C.came on
D.came at
答案
参考答案：B
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After several days of heavy rain the roof（）with a loud noise, crashing (坠落) onto the ground.
A.came out
B.came down
C.came on
D.came at
参考答案：B