1.It happened___when I got off the bus in Beijing.选A对么?
A.to rain B.raining C.rained D.to be raining
2.___of the noise,he shut the windows.选C对么?
A.Tiring B.To tire C.To be tired D.Being tired
3.___to the right,he suddenly found the shop he was looking for.
答案选D为什么不选C呢
A.Turn B.To turn C.Turned D.Turning
4.I did all I could___him.答案是B为什么不选C呢
A.helping B.to help C.helped D.helps