In fact, _______ one cause that leads to the problem.
| A．cattle is | B．cattle are |
| C．cattles are | D．the cattles are |
________small，the company has about 1,000 buyers in over 30 countries.(2013·天津，5)
| A．As | B．If |
| C．Although | D．Once |
Only by increasing the number of doctors by 50 percent ________ properly in this hospital. (2013·大纲全国，32)
| A．can be the patients treated |
| B．can the patients be treated |
| C．the patients can be treated |
| D．treated can be the patients |
It was only after he had read the papers ________ Mr.Gross realized the task before him was extremely difficult to complete. (2013·大纲全国，30)
| A．when | B．that |
| C．which | D．what |
“Never for a second，”the boy says，“________that my father would come to my rescue.” (2013·江苏，27)
| A．I doubted | B．do I doubt |
| C．I have doubted | D．did I doubt |
Can you tell me________it was________your cellphone was lost?
| A．where；that | B．which；that |
| C．that；where | D．where；which |