___________ many times, but he still couldn’t understand it.
| A．Though he had been told | B．Having been told |
| C．Having told | D．He had been told |
________ unemployment and crime are high，it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
Today，we will begin ________ we stopped yesterday so that no point will be left out.
| A．when | B．where |
| C．how | D．what |
He had his camera ready ________ he saw something that would make a good picture.
| A．even if | B．if only | C．in case | D．so that |
I travel to the Binhai New Area by light railway every day，________ do many businessmen who live in downtown Tianjin.
| A．as | B．which | C．when | D．though |
Jack wasn't saying anything，but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
| A．as if | B．in case | C．while | D．thought |