—This returned Chinese scholar has become one of the top experts in this field .
—Yes , I know him very well . He in Africa with wild animals for eight years .
| A．has worked | B．had worked | C．worked | D．has been working |
Not once ________ to Michael that he could one day become a top student in his class.
| A．occurred it | B．it did occur | C．it occurred | D．did it occur |
Not until he went through real hardship _____the love we have for our families is important.
| A．had he realized | B．did he realize | C．he realized | D．he had realized |
（2013·大纲卷）Only By increasing the numBer of doctors By 50 percent properly in this hospital.
| A．can be the patients | B．can the patients be treated |
| C．the patients can be treated | D．treated can be the patients |
（2013·新课标Ⅱ卷) It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.
| A．when | B．that | C．which | D．What |
（2013·新课标Ⅱ卷) Only by increasing the number of doctors by 50 percent properly in this hospital.
| A．can be the patients | B．can the patients be treated |
| C．the patients can be treated | D．treated can be the patients |