Only when_______ 30 years old ______ to learn English.
| A．was he; did he begin | B．he was; he began |
| C．was he; he began | D．he was; did he begin |
Sometimes, ______ a patient a get-well card is better than visiting him.
| A．to be sent | B．being sent |
| C．having sent | D．sending |
The report aims to explain how these conclusions ______.
| A．were reached |
| B．had been reached |
| C．have reached |
| D．had reached |
This is not my story, nor ______ the whole story. My story plays out differently.
| A．is there | B．there is |
| C．is it | D．it is |
Grandpa was shocked by the news. Rarely ______ him so quiet.
| A．do I see | B．had I seen |
| C．I had seen | D．I saw |
It suddenly occurred to him he had left his keys in the office.
| A．whether | B．where | C．which | D．that |